ctfdump: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/ctfdump - from package: ctfutils

You may install the required package with command apt-get install {package}

Error in other languages:
ctfdump: bevel nie gevind nie
ctfdump: comandă negăsită
ctfdump: comando não encontrado
ctfdump: commande introuvable
ctfdump: command not found
ctfdump: käsku ei ole
ctfdump: không tìm thấy lệnh
ctfdump: komanda nerasta
ctfdump: Kommando nicht gefunden.
ctfdump: kommandot finns inte
ctfdump: komut yok
ctfdump: nie znaleziono polecenia
ctfdump: níor aimsíodh an t-ordú
ctfdump: no se encontró la orden
ctfdump: no s'ha trobat l'ordre
ctfdump: opdracht niet gevonden
ctfdump: parancs nem található
ctfdump: perintah tidak ditemukan
ctfdump: príkaz nenájdený
ctfdump: příkaz nenalezen
ctfdump: команда не найдена
ctfdump: командата не е открита
ctfdump: 命令找不到
ctfdump: コマンドが見つかりません