Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6cfc454389a2f9…

MALICIOUS

PDF

39.0 KB Created: 2021-07-04 04:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1a08a681b9737e1ee6e0c7880d0aa0c SHA-1: 907d621d2317d0ef630b9e1393c88eef1aa5682b SHA-256: cf6cfc454389a2f98c4dd6d1f8a69a8c08258a42127e821c4301e8ff1b6cc7e8
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-based lure, typical of phishing campaigns, containing numerous links to external resources. The presence of multiple links hosted on compromised CMS upload directories suggests an attempt to distribute malicious content or redirect users to phishing sites. While no scripts were explicitly extracted, the structure and heuristic firings strongly indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8504

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://candybeauty.vn/upload/files/41330512381.pdf In PDF document text
    • http://mnogonomerov.ru/uploads/file/33032542240.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b212da99---boper.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b81052b567---guxedixapepevetigo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4e8154e4963bddae8c709a3c44b25d30/kigawibidavur.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/skji67rl5biefpo6sh8sqp47qm/90131648604.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/47634686410.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3afeebdb8c---27529043278.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4070e043083da18e17acc071816305f/purar.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9ac5ba60---61224391692.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729ded6cd7c---dunemafunemirera.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/29226938625.pdfIn PDF document text
    • https://termocasasrl.com/file/lafonupofulikizekerijalin.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/bajokomizafezitesinujeris.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+pen+out+of+faux+leatherPDF link annotation

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