Malicious PDF — malware analysis report

Static analysis result for SHA-256 667bd1b9c0ec36ab…

MALICIOUS

PDF

80.3 KB Created: 2021-06-12 08:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e2a9f8f37654e2b22f4d725ce0bad60 SHA-1: 1a35b789f7af21fa6996d5093910a9ad622f479a SHA-256: 667bd1b9c0ec36abf8a03bbf370d3345b4604398b733e1877fef5b0fae1f3244
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites, leveraging SEO tactics with terms like 'geometry dash free demon'. No scripts were extracted, and the document body was largely unreadable, but the heuristic firings strongly point to a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=geometry+dash+free+demon
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c30b9b0b51e---40467032794.pdf
    • http://consulcongress.it/uploads/assets/file/kagedut.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e826e77751accdce85044d4d5d0c3ecc/vawelikajijewurifaju.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8593311859e2d9fd317f161cb974c5c2/zuvilevupemud.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/c29d08bb9a50282374efa226e0a7a597/duretikumosonusubekome.pdf
    • https://tavcam.com/upload/ckfinder/files/dulelopavifekapasago.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608388afe212a---97228848542.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fa5431366---denumu.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4cf72d8773ba81aa16ef6d6995238000/bexagibelixumo.pdf
    • https://aduanaldelvalle.com/userfiles/file/84431903318.pdf
    • http://kfbi.ru/content/file/21324990948.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca050bd14e---4511629990.pdf
    • https://brod-plovdiv.com/images/talupudemixenifazi.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee1333227---pakepubibakufawi.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_off0000f0eb.bin
c5b666e4f07ce691861be1473e8727c280c8d8546c4772061943f80eabf58594		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 5248 bytes
font_01_sfnt_off0001029f.bin
929d13d35fd340bf6dae11d2a000a808a43c816688de4eeefa12b03fa686bb4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 22488 bytes

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