Am using Apanhas plugins for more than 18 months, never had a malware or other there. Completely trusting it. My mode of working: Develop, get the plugins i need, configure and use. Upon release to a client make them pay for the plugins in final use.
You can trust this site, I wouldn't have stayed with them for as long as I have if there was a problem. Plenty of dodgy sites out there, but this isn't one of them. You're right to ask, but you're ok here, it's a brilliant, honest site.
Although i am not renewing membership regularly, i am using nullfire since many years & have no issues, for safe side - use VirusTotal Scan service. Sometimes Wordfence gives error about file change (screenshot attached). But i see that those are made by @Apanha for nulled plugin to work.
Been here for some years now. Haven't had one single issue and I download MANY plugins from here! And because I also do buy many plugins / addons I have run diff comparisons of plugins from here against addons that I have purchased (including rev slider) and the plugins from here will be 100% untouched or in just a few cases the lic is activated so that it will work for you.
Another major reason I like this site is because there are plugins here you won't find elsewhere. And many other places will label old versions as if they are new latest versions!