Sometimes, when u search in Google, you may notice that some websites are marked as “This site may harm your computer”. This indicates that that specific websites contains malware either intentionally or hacked. Google provides an service to check if your website contains malware.

• http://www.google.com/safebrowsing/diagnostic?site=www.example.com

Here is an example.
http://www.google.com/safebrowsing/diagnostic?site=https://ykyuen.wordpress.com