Last month I had actually read the news about the case links injection in WordPress, because I think my blogs are safe, so I would just leave. In fact, this blog is also a victim. Then I leave work and briefly review the blog to settle the problem.
What is the link injection?
Try one of the following ways:
1. Go to this page and enter the address of your Wordpress blog (can not subdirectory). Then there will be a new page (pop-ups) is open. See the source code of its (View - Page Source in Firefox).
2. Go to Google.Com, type site: yourdomain.com in the search box. In the search results, click on the Cached page one of the indexes. Once open, see the source code.
If the source code on the page, especially on the bottom, there is a code that unknown (in the form of a list of links to other sites), always, you have also become a victim 
There are some solution (because there are also some cause) and can read your own here. I only use one (or two) the most simple. At least it succeeded in overcoming problems in the novarider.com.
Select the delete function to discern wp_header (on the template header) and wp_footer (on the template Footer) from the Wordpress theme used.
You can use the same way, but remember, when using the plug-in All-In-One SEO Pack, the removal function wp_header will lead to the plug-in is not running.
Survivors struggle against injection attacks, friend
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