I have this problem also. I know 2 persons using adsense for years on nulled websites without problem. I think they implemented adsense before google started reviewing websites. But I don't know how they are still not banned.
Hey mate, what wordpress theme are you using?
Thanks in advance
first create clean website without nulled content
post 15 to 20 article and create page like contact us, about, term and condition etc...
and apply for google ad-sense after that share this kind of content
but recollection don't use ad-sense for this kind of site they are lot's of ad networks they easily approve your site