google has been block 3 website that hosted on same server for this reason :
What happened when Google visited this site?
Of the 103 pages we tested on the site over the past 90 days, 33 page(s) resulted in malicious software being downloaded and installed without user consent. The last time Google visited this site was on 2013-10-09, and the last time suspicious content was found on this site was on 2013-10-09.
Malicious software includes 41 exploit(s).
i have scan server with clam and LMD but they cant find anything
Kevin Cheri : Senior Server Administrator / Freelancer : 9+ years Exp, reach me out for any help Server Optimization Expert / Mysql Guru / Migration Specialist
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I had the same issue with one of my personal wordpress sites. Once you find the malware content and clear it up, google will white-list your web site within couple of days. Don't forget to apply any script/module updates you might be missing.