Malicious PDF — malware analysis report

Static analysis result for SHA-256 947b5391736d0b99…

MALICIOUS

PDF

87.9 KB Created: 2021-06-09 05:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3370349800666960a341e2a9ba7d3f6 SHA-1: b541b4fcd238fe6913db7743caa0ca5d44ac90e3 SHA-256: 947b5391736d0b996606c597007a898003375853705e3caf2032d3822f6a08ca
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 numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://infrive.ru/uplcv?utm_term=correct+tense+questions+and+answers+pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0136b65731---30691676411.pdf
    • https://aartipalette.com/userfiles/file/girovitoneneluzumiveruzi.pdf
    • http://flatadministration.com/uploades/fckeditorfile/10100772535.pdf
    • http://bensonlandscape.com/editorData/file/pabaderuxisolevegexexagaf.pdf
    • http://vimbark.sk/editor_uploads/files/kotuxegisi.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504085600106397.pdf
    • https://balajitutorial.com/admin/userfiles/file/josonuligobufuzimexalan.pdf
    • https://aslimitada.com/userfiles/file/xunetipivotusuvobezidil.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d692391c9---30704590250.pdf
    • http://accessiblevehicleservices.com/userfiles/file/15187985101.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8qrufhc46ocuq9kstkjk4j2k44/26487225723.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/kapagibasetesalelito.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/545cfe69797b02ea69d8997bdddf4da6/jifaluvurabijanunojuzi.pdf
    • https://euroroma-bg.org/files/file/30923194403.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/k74nc7a407l25vstbf3qgb4mj2/gironuba.pdf
    • https://triangle-electronics.com/assets/userfiles/file/55596491951.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f82b.bin
a202e0a47df91d58befdd3d4216dbd8e46ad6d60b5b7a679d4dc519ee21e890e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 5240 bytes
font_01_sfnt_off00010a15.bin
1a303e7e26db6e65e3237f847748deee7ce73ef0e17e9e69cf476c2c44e21ee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 10784 bytes
font_02_sfnt_off00012f14.bin
18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F14 16144 bytes
font_03_sfnt_off00014414.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14414 4324 bytes

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