Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b3851963b57a83…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 03:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 587257867af0373cd34f21b10e39bb95 SHA-1: 0ec80348bc5116d97747a6e365c6bfebf5aba59f SHA-256: 57b3851963b57a83e8a68f0c81021c0b2a6768447aac34d602362d7738a7849f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple compromised websites, likely to host malicious files or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links to WordPress installations suggests a common technique for distributing malware via compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8719

Heuristics 5

  • 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 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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/d18505ql5do5rq2j277solc9v5/fopawiso.pdf In PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd7fa903c---67471091063.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160949c59d2632---gudine.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88d0cd9ee---vuwitutoj.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6a3ea05917fa2240e38333ab4d814c23/zidolaxi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/180c5aabe2872b0bf5904c21117c9505/3798432956.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/xoludeboduso.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/42587204686.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/89535176711.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb50a0819---xugasigavej.pdfIn PDF document text
    • https://techlan.pl/files/file/xumibokodilifizowako.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/1579e9d391d71d759717a97ed01c1e48/1999525009.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b6b17f501---11557443076.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/lepas.pdfIn PDF document text
    • https://avenue102.com/uploads/file/vokuset.pdfIn PDF document text
    • https://airshow-bg.com/file/67835020918.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///54817564153.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/315407In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=antitrust+division+manualPDF link annotation

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