I don't know the way the dbf-files are build , but I would be supprised if it could,
sqlloader works for "flat" files with fixed width columns or colums separated by special characters.
(you have to name that character in your control file)
If it is possible to the export the dbf-file to a csv-file do so, preferably with columns separated by ;
Then try again with the csv-file.
By the way : what does the report look like know?.