The PDF format can be quit complex so you will not be able to edit in Nano or Leaf. in fact the document that describes the format of the PDF file type is over 1,200 pages. It contains sections about the various compression methods that could be applied to the text and images and what types of encryption could be applied to the PDF. It could also be possible that the PDF has Digital Right Management, DRM, applied to it that prevents any alteration. So first you need to determine if the PDF has been secured or not. If not secured then you maybe able to edit the PDF. Possible PDF editors include GIMP, and LibreOffice.There is also the PDFTK,PDF Tool Kit, from PDF Labs that can remove passwords using the password, and uncompress the PDF. Once uncompressed one can change the text strings within the PDF.
If one looks at the permissions of the PDF using the file manager, one will see only the owner of the PDF for MAGPI 75 can edit the PDF. You can ask the publisher to correct the misspelling, for the password, or live with the misspelling.