diff --git a/backend/src/SignDocument/Services/DigitalSignatureService.php b/backend/src/SignDocument/Services/DigitalSignatureService.php
index 5b5744a..811416b 100644
--- a/backend/src/SignDocument/Services/DigitalSignatureService.php
+++ b/backend/src/SignDocument/Services/DigitalSignatureService.php
@@ -31,9 +31,9 @@ class DigitalSignatureService
             $document = $this->api->download($request->url, $token);
 
             exec(sprintf('cp %s %s.pdf', $document->tempFileName, $document->tempFileName));
-            $signature = exec(sprintf('cryptcp -sign -detached -der %s', $document->tempFileName));
+            exec(sprintf('cryptcp -sign -detached -der %s', $document->tempFileName . '.pdf'));
 
-            $response = base64_encode($signature);
+            $response = base64_encode($document->tempFileName . '.sgn');
 
             $this->removeExistingDocumentService->removeExistingDocument($document);