Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdd7028085670ea…

MALICIOUS

PDF

103.8 KB Created: 2021-06-06 03:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b5869842813faeb9c5bd7c2c63abd4a6 SHA-1: da640115a852a5fcb7bfb42cc7c80352a92396bd SHA-256: 4cdd7028085670ea2de66d17bfea6553102a17e37ebd0ac5acc306c09c0be71c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://medvor.ru/uplcv?utm_term=como+hacer+guion+de+comic PDF link annotation
    • http://aceonlinementors.com/userfiles/file/41813365750.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1f6bd5475---89162144849.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc24499ee1---74321634246.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/zawavajupowoken.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/55ce4f5bd8af9f8d1263b508ab17f3d0/lajanifu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fe672af83---vujakosoporipiropifimepu.pdfIn PDF document text
    • http://aven.su/userfiles/file/2911246771.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa05eb72dc---pobofokufejaranosimolo.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/67960068920.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/72mn076l924upcbn5k6vqkhhvb/xorutewemabamasofewez.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/t3m4aukrvjhdcihmo4r1td90a1/1768702558.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qpj559ckfq13jsc5h23qrc3b19/pugufoguwilukipuzaf.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/369fe842844852d24ff40aed38902a86/60235502877.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6ca733f52c0f3dfe2223f3e8ba88c1ba/21379657120.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000158b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B7 5048 bytes
SHA-256: 15e35156f7fe19a3a83dc39539376673de0fe11bd1491c79b9aca357e5f97ffc
font_01_sfnt_off000169af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169AF 12628 bytes
SHA-256: 4bcb5ee50084bc822a0514201b82f9fc04a09905f85dce9f240285f4aa3b86d9

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