I need to do some batch operations on PDF files and every StackExchange answer to questions similar to mine involves pdftk. But with dnf I get no matches for dnf search pdftk, no matches for dnf provides pdftk, and the only Fedora-specific question about it that I could find was referencing Fedora Core 6.
Pdftk was retired from Fedora 6 years ago. There is Stapler (in package pdf-stapler), which is a pdftk replacement written in Python. Alternatively, there was an article in Fedora Magazine discussing pdf modification tools, maybe one of those will suit your needs as well.