Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20c46b2e2b24872…

MALICIOUS

PDF

73.3 KB Created: 2021-05-01 08:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54e84c814e893f73458bca90ea21eb8b SHA-1: 387cf183df20675d5ef77fac9ad6a9e57de8ea95 SHA-256: c20c46b2e2b248725741deed7b20cbb9cfa563d5cd2205548e03db7f7d52e256
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ce9f3f0e1787f3fe725026b73cfbcddb/vesuno.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083cf4b99f09---getaduguveneli.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/ac59ec405bbce40b6c6c06e17fbac0c9/rajuv.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a749aceba5---98205833012.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/dc6fc4d4eb29a3df701311e87609c82e/97482128401.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085273198db2---44788429888.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854ffb2692c---meluv.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/opb97vn83jcrad9k89hjo7nm1l/lunugomutisibazagidufe.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8ea2d9575ae58e638c172c7a1edae0ea/75396418072.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/786e765b8ea270a7016b41c9021308a0/penekanurovesivudasume.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/408b8d84001bb7e33576d3694b63e2b3/sapotazonafoneketawon.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93a03b283---77343731005.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/706c43298566a172133c3bb342cf92b4/55108727544.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=at%2526+t+u+verse+guide+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d346.bin
f1fbfa2d0c33c67e7874cebfb68628a854b2b6bb6b35cae5f965844416526ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 3552 bytes
font_01_sfnt_off0000df01.bin
3b7808f421006825a3306bf0ef25d7c6feb3973ee50739351ef79dd64bebb985		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 17716 bytes
font_02_sfnt_off00010d46.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D46 4324 bytes

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