Your WordPress installation has likely been compromised.
Contact your host and ask them to look for recent suspicious activity.
We had an issue like this a while ago, an account had been compromised which let the intruder inject code to our blogs. MojoHost were able to track it down and added extra security to prevent it from happening again.
it seems that my blog distributing malware and malicious code was added by third parties. Any suggestion please
I had the same problem across my whole blog network (that sounded big but its only 8 blogs...lol) For me it was the gumblar.cn exploit and then it changed to martuz.cn. Once you remove whatever it is you have to submit your site to google to have the warning taken off. I found a tool to remove my problem automatically but I can't find the bookmark to shoot you a link. If you google around you'll find it.
There are many different types of these injection codes. Some use php code that is encoded, some use java script and some just use simple iFrames. They all result in loading a remote url that is generally a virus installer.
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