Hacked site – remove results from Google permantenly

Hello,

I think my site got hacked – and i noticed it after i searched for my site on Google, that suddenly 300 pages was found on my site, when I maybe only have like 30.

It seems like some kind of china/japanese “hack”. Look at my attached image to see a preview of my site-results in Google. http://i.imgur.com/kRgE8oF.png

So I went into Search Console and removed +90 URL’s which I found on Google, which looked like that. Problem is it’s only temporarily, and when I visit the page in Google search results it’s already a 404-page.

So my question is, how do i remove all the URL’s permanently? My site is WordPress and just installed Wordfence for information.

Regards