E-Publishing PDF File Books as E-Books

I need assistance to publish PDF files as eBooks in a non-flowable, fixed format.

Requirements:
- Publish on multiple platforms
- Use standard design elements
- Static content only, no interactivity

Ideal skills and experience:
- Experience with eBook publishing
- Familiarity with Amazon Kindle, Apple iBooks, and Google Play Books
- Ability to work with PDFs and maintain fixed format