Wait poppler-utils can do a lot of pdf related things. Haven’t tried rearranging but it has tools for separating pages and uniting them. And pandoc can covert between a lot of document formats. But it doesn’t do it from pdf, can use pdftext, inkscape, graphicsmagick etc based on what you want to extract (text, vector graphics, raster graphics) etc.

Didn’t even know about the org, but that’s the QR scanner I have been using.

Many people accept ad, or online website to do simple things like QR code, file conversion etc way too easily.