QGIS Expert needed to determine GPS coordinates on PDF map

I need someone who knows QGIS (or ArcGIS) software to determine GPS points on a PDF map.

Here's the PDF:
https://test237a.b-cdn.net/Map.pdf

Location reference: The lake in the upper left of the maps is at: 38.881, -120.069

I need the GPS coordinates of the corners of the three black rectangles (the ones with red x's) in these two PNGs:
1) https://test237a.b-cdn.net/Rectangles1.png
2) https://test237a.b-cdn.net/Rectangles2.png

If you're bidding, please let me know what kind of accuracy you'd expect.

And if you have any questions, please let me know.

Thank you for reading/bidding!