Malicious PDF — malware analysis report

Static analysis result for SHA-256 81832699661c3956…

MALICIOUS

PDF

39.0 KB Created: 2021-09-01 16:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2512487cb4befb50bb03d04b406af12 SHA-1: 542a2a2f33712152ef81358bf62116c0e611f5a9 SHA-256: 81832699661c39569d6c6970cadf68e2b8291ddb9633836d4bd77b3b318d65fa
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is identified as a phishing lure, likely using an image-based approach to conceal clickable links. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or harvest credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8495

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/cef0fe28de32453250564e50de23c915/nabaxubejapisoxote.pdf In PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/fekogebugebafipodovakaxu.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/komuravumuzonagasarig.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a197c895818---sawixefugonomabami.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/73954610295.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b2f632b9a---dodikidemusumawumululel.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/pesivuna.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079d810dea37---guzofitu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/35615rmts73sc1f48cheuh7ef7/41769030491.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/27435522534.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b55eafb9---42771899464.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/be47633c214f403d93f86bdbc86debdf/woposegipawunelejik.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8db4f8fefd---tudagotimobesefaralonikos.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-13/20210613172702393020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=diffuse+t2+hyperintensityPDF link annotation

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