Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcd2d7ca4dd9589…

MALICIOUS

PDF

85.4 KB Created: 2021-06-19 22:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b9552bf0c8d32616f16b36382c4c5fa SHA-1: e885d98aca7fc79ea78fdb41437bf2b5916ab315 SHA-256: 7dcd2d7ca4dd958994103d0b86463a5a66be9557c965ba785b24c7f11efcb48a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://archism.ru/uplcv?utm_term=summarize+olaudah+equiano+recalls+the+middle+passage
    • http://yokohama-model.com/userfiles/files/68969785181.pdf
    • http://baohanhranghm.com/upload/img/files/9293358866.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/37913f883020c54c9760594da7ef4a1d/notivux.pdf
    • https://cowichanseniors.ca/userfiles/file/96275146563.pdf
    • https://hoakhanh.vn/uploads/image/files/45722541785.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6dd98255ff57de5b767abcd786bc3f96/newizinuropil.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f275277a99---35136235286.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/mr76fik0gjohgfp0adlgi8a6j6/8401342114.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097bfca88ac8---volepobesememajexerido.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/e5v2qt1vp6c64nop51ctmm6lqt/83962044339.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c08f06583497609deaaa51e01e887d59/59229247958.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c6bfd6125ef48b57abd8c614e1134156/xelabilebunif.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc00ef4157---numefasesawumogutu.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/upr2olmj3c67hcd0u161tco5so/58497120710.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dac.bin
ac166de39d9f403df11f06cdf5266ecc15766c1bd5d5487ba6d97f80011c8add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 5768 bytes
font_01_sfnt_off00012115.bin
07276a8cf638d62445f5803924400d3e6fcea63714fd0cf621aae3e471425225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 11684 bytes

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