Such as a book cover ? Then perhaps it's better to export both as PDFs and use a tool such as PDFTK to join the PDF of the cover with the PDF of your document.
I've been using this method for many years and I find it more efficient to keeping my complex covers on the main document files.
pdftk Builder(GUI for pdftk server)/pdftk server will do the deleting selected pages.
PDFTK Builder and other PDF Resources: http://angusj.com/pdftkb/ PDFtk Server: https://www.pdflabs.com/tools/pdftk-server/
I;ve been using the freeware pdftkBuilder (http://angusj.com/pdftkb/) for over a decade, and it does everything pdf Toolkit does in its Pro version as a freeware, also using pdftk. Simply drag any files you wish to merge into the files box that presents itself when you open pdftkBuilder and choose the pages from each, moving pages up (forward) or down (backward) before saving the merged file.
pdftkBuilder also bursts pdf files, rotates, them, adds watermarks or backgrounds, all for free and easy to use.
Method 1. Download pdftkbuilder. Drag the 8 documents into the window, and designate page 8 for each, click on Save As, and name the result something like "SiteH.pdf". Voila, an 8 page document. For the other 100 sites, just change the page number for each of the 8 documents, and go on
Method 2. Download pdftk.exe and place it with the 8 PDFs. Open up a command window. Using Notepad, create Makefiles.bat with the following line.
pdftk A=file1.pdf B=file2.pdf C=file3.pdf D=file4.pdf E=file5.pdf F=file6.pdf G=file7.pdf H=file8.pdf cat A8 B8 C8 D8 E8 F8 G8 H8 output SiteH.pdf
Now copy this line 100+ times in notepad and replace the A8 B8, ... with the page number you want; the first part of the line remains the same.
Run the batch file, and it will do everything for you.
PDFTK rocks!