Finding a safe, legal copy of a specific PDF can be tricky, but for 'Kingmaker', focusing on official channels and well-established publishers is the most straightforward approach.
My understanding is that 'Kingmaker' refers to the fantasy novel by Christian Cameron. The best route is to check major digital book retailers like Amazon Kindle, Google Play Books, or Apple Books. These platforms sell legal digital versions, and the file you download is typically in their proprietary format, but it's essentially a secure, licensed PDF-equivalent for reading on their apps. Libraries are another fantastic resource; services like OverDrive or Libby let you borrow the ebook with a valid library card, providing a completely legal way to read it for free.
I'd advise against searching for a free 'Kingmaker PDF' on random websites, as those are often pirate copies that infringe on copyright and can come with security risks like malware. The author and publisher deserve support for their work. If budget is a concern, the library borrow is a perfect, risk-free solution.
Last I checked, the book is readily available for purchase or loan through those mainstream channels, so you shouldn't have to venture into sketchy corners of the web to find it.