CIDFont+F1, F2, F3, and F4 are not specific fonts you can download from a website; they are generic "placeholder" names created by software (like Adobe Acrobat or InDesign) when it encounters a font that wasn't properly embedded in a PDF.
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What “F1–F4” usually imply
You cannot download "CID Font F1, F2, F3, or F4" because these are not actual font names CIDFont+F1 , F2 , F3 , and F4