Crop the white background out of ~1350 scanned photos - repost

I have scanned approximately 1,307 old family photos. Each photo has been scanned to an individual file. However, the scanned images must be cropped to remove the excess white background. I require that the file names be retained for the cropped photos. I can provide an example if necessary. Most photos exist as image file types - however a few exist as PDFs (if you cannot do the PDFs I can do them, as there are so few) I know this project is not very difficult, but time consuming. The files will be delivered to the winning buyer via dropbox - due to the size of the photos, dropbox is suggested for delivery of the finished photos. Would like delivery within 48 hours.