[CentOS] decode http hack attempt?

Thu Sep 24 13:13:52 UTC 2015
James B. Byrne <byrnejb at harte-lyne.ca>

Can anyone de-cypher the second entry for me?

--------------------- httpd Begin ------------------------


 Requests with error response codes
    403 Forbidden
       /: 9 Time(s)
       /?c=4e5e5d7364f443e28fbf0d3ae744a59a: 3 Time(s)

I have found the string via Google but have not located any explanation.

-- 
***          e-Mail is NOT a SECURE channel          ***
        Do NOT transmit sensitive data via e-Mail
James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3