Malicious PDF — malware analysis report

Static analysis result for SHA-256 d464cd8b2023a378…

MALICIOUS

PDF

73.6 KB Created: 2021-05-30 21:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3656b20888ddf96e1f72dc84256ab82d SHA-1: 5b5d56aed7c457ec93f38d303330a506ef967234 SHA-256: d464cd8b2023a3787b2f2a458376829eba3ad90e646c5ff4829540649dd842bb
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The document body text, while appearing to be about a carburetor diagram, is likely a deceptive pretext to drive traffic to these malicious URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://oniceh.ru/uplcv?utm_term=suzuki+250+quadrunner+carburetor+diagram
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a5ce6c02c3732e3fb4b67dafce8165a6/92460679680.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a5d5d59e5e25b3766b7db9035df5f0c7/nufeguzosuguwinolaw.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4a217c95346031ae401ed244a275ac14/xuxudafogoluj.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad83916fbd---51703895083.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884337b8c19---vegopugomeketulapiviriwe.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56b0a690b---vavavezesiwupexixanuges.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/dameliwotoxedekoz.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/in3qaa43m716b6l4e9mkbljtn7/7377752615.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/rcnf4jlfdu2qu445tr5db9r9ge/zagaz.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/be07d158bf32356146525fdba0818e3b/soxazugumolipexusumexub.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160753ea701753---56960034913.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907655c127c---61737446852.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754e6e8ff13---1968808317.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1eb265f750758faaf468e83f37b28b3c/35038626733.pdf
    • http://ottotech.center/userfiles/file/2435822948.pdf
    • http://animationcoach.com/userfiles/file/51076499528.pdf
    • http://alphasigmaoverseas.com/userfiles/file/pisowemudikoxedavo.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_off0000dfce.bin
67c6d31e6275d107ae150c28616d0a891c5eaa5fe3f3cdc9fc9f2d7a5acaba9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 5928 bytes
font_01_sfnt_off0000f3f2.bin
47284b0e54cf616adf85786705134c391a06f254c913a3c38354e10a34a4da33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 11108 bytes

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