That is the cause. You need to delete the plugin entirely if not it will still happen.
Also, check your users table, there will be a new user created by the hack. So delete it too.
It happened to me also.
It affected all my site I used that plugin. Although they have patched that bug in the...
Do you have WordPress automatic plugin installed? If yes, than that might be the case. Check your registered users and see if you can find something new there.
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