Shivani Sharma on "Google says some of my site pages may contain hidden text or cloaking, technique"

Google mailed me this.. now I want to ask my all WordPress user friends how to get out of it ?

http://all-specs.com/: Suspected hacking

Google has detected that some of your pages may contain hidden text or cloaking, techniques that are outside our Webmaster Guidelines.

Specifically, we detected that your site may have been modified by a third party. Typically, the offending party gains access to an insecure directory that has open permissions. Many times, they will upload files or modify existing ones, which then show up as spam in our index.

Sample URLs:

http://all-specs.com/
http://all-specs.com/apple-iphone-6-full-specs-features-release-date-price-in-india.html