How do you rip the text from multiple images to one text file?

It depends on how the PDF was put together. If it incorporates a text layer harrymc's answer is your best bet, but if the PDF contains only image files, then extracting the images and using an OCR app like tesseract is your only option.

Open source (free) software gives you much greater resources than any pre-packaged solution to your problem. The only problem is that they are command-line tools which require a heavy investment of personal study and practice before you begin to realize their benefits. There is no "user-friendly" app will do what you want. If you are interested in learning command-line approaches to this problem, then as an absolute minimum start with pdftotext, pdfimages and an image manipulation system like imagemagic to support tesseract