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Keep your wordpress files up to date all the time. Backdoors and injections like this are usually exploited on older versions where they still exist.
It's a pretty steep precaution but you can change your cpanel/database/wordpress passwords. Change them to something that is not randomly generated because if they have the algorithm to generate the password they can brute force it in (I believe it's common for cpanel logins).
This injection causes search engines to index your site with those phrases that are hidden. If you search those terms your site is going to end up on google. Usually the case if you have a decent amount of traffic.
Might take a while to get off it if you've been indexed already. Not too sure how long it actually lasts. It's more to get your site to appear in search terms than anything.
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