Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a556a9412204452…

MALICIOUS

PDF

48.0 KB Created: 2021-09-26 15:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c282cab4fafc28eb0b69d757c4601120 SHA-1: 4e8270f1739cf89be814fbf9cc33a1a73b71f5c0 SHA-256: 8a556a94122044528cadfe48a441223e5273d74a8277a4523b6a279df7c45e40
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of external links suggests the PDF is designed to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6808

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=watch+it+follows+online+free+123 PDF link annotation
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/xigazamuvelun.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/b4586614e5c2a7db872a0e21e9435e05/topiduvozo.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/94495702901.pdfIn PDF document text
    • https://msiutilities.net/documents/11074306108.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/bobidawana.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/69479112646.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/12955783379.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/gagejepufubigaxajoluze.pdfIn PDF document text
    • http://emaaravm.net/upload/files/vufifirovabixenele.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/9adf6aafcacc3cbc245110b44d8d0d56/19695349092.pdfIn PDF document text
    • http://generaldistco.com/images/file/biruvojurofikulej.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/19438757204.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/sevudibudofulijoxe.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/jefodagoki.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/73927f76315ac988274741ad3bc50bbf/47716276570.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134cd3f245bb---bonosewevakoz.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109192105234827.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/lazobozozapojizi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc5f938edc---91391517595.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1293472aa---725011924.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/rovimu.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/72063594995.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/74691767167.pdfIn PDF document text

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