Malicious PDF — malware analysis report

Static analysis result for SHA-256 3744fec572d3c462…

MALICIOUS

PDF

70.5 KB Created: 2021-06-02 14:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9fb35967e06d5e615905f3977646977 SHA-1: b9a7b18fbcaf37162e542e3fd494cb6f6520ab11 SHA-256: 3744fec572d3c46211a71bc35303f0de26bb64f8ddf085e26454b4a1c1948881
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The document body, though heavily obfuscated, appears to be a lure related to an 'Onkyo rc-799m remote manual'. No scripts were extracted, but the presence of numerous links to potentially compromised sites indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://nordicaluminium.ru/userfiles/file/85268064876.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/52da97bdc058d8ac61ad044ee3013196/99669219186.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffca2e480---679154892.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0bad2eqbv2947t81vfou69hmp0/98413085783.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce23778c63---ditizevan.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805cc073208---dikogoxulubuwojiman.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/d2e48474aea4013a0cf220c9cae97e87/70139132328.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba54f55ff0---ximulobefi.pdf
    • https://novahealthclinic.ca/userfiles/file/42122851969.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/mdmns4qbs5baaqtn7v9cf11mq0/30704426683.pdf
    • http://aylincinarli.com/fckfiles/file/19749927019.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e1f64bfd---89373770944.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf3538688---mavimefedebozuz.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4694d3eea0---57831295105.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092a932b03ea---18532757894.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec33f32bc8---48669162904.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c35c34ff8---sesapidamepuwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=onkyo+rc-799m+remote+manual
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcdd.bin
513292b4f38757b317db359cdc73e26bb19a630e35c716ea35b52e85c1411d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 5228 bytes
font_01_sfnt_off0000eead.bin
55e00ee8d1656e0d279b3c8a7db7141c0c8a12444c46b588c3ef3b9ccde9c753		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10676 bytes

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