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The only real way to change fonts in a PDF would be to convert it another format, change the font and then convert it back.
Think about what a PDF is. It tries to emulate a paper document. It's basically a map of the exact locations of individual letters/characters. Since characters are different sizes (both absolutely and more importantly, relative to each other) in different fonts, if you replaced the font with another font, but kept all the locations the same, the document would look very weird: some characters would overlap each other, and others would be too far apart. If you tried to rearrange their positions, lines of text would run off the page, etc.
So if you want a different font, you'd basically need to start from scratch with a completely new document. You could do this, of course, by using a conversion program to convert a PDF to HTML or RTF or something like that, and then edit it, and possibly convert it back. You could use a combination of calibre and your favorite word processor, or other software. However, conversion is always liable to introduce errors, and PDF conversion rarely goes smoothly. So do think about whether you can live with Times. (Though I find Times very boring and suboptimal for ebooks too.)
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