This is because Google performed a regular check on the website in the past 90 days. The results were this:
Of the 1513 pages we tested on the site over the past 90 days, 4 page(s) resulted in malicious software being downloaded and installed without user consent. The last time Google visited this site was on 2013-10-23, and the last time suspicious content was found on this site was on 2013-10-23.
Malicious software includes 4 trojan(s).
Malicious software is hosted on 4 domain(s), including cobbcountybankruptcylawyer.com/, stephaniemari.com/, northgadui.com/.
3 domain(s) appear to be functioning as intermediaries for distributing malware to visitors of this site, including stephaniemari.com/, northgadui.com/, satnavreviewed.co.uk/.
This is probably because people are leaving links to these websites throughout php.net
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Related: https://news.ycombinator.com/item?id=6603831 http://productforums.google.com/forum/#%21topic/webmasters/puLmvjtK0m8
– Bob – 2013-10-24T11:15:01.4572
According to this thread on Google's webmaster forum, someone managed to inject an iframe into the site :) The suspicious file seems ok now, but logs show that it was containing malicious code before
– onetrickpony – 2013-10-24T11:15:17.767Matt Cutts tweeted this write up
– Martin Smith – 2013-10-25T18:37:23.620