Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f6e40c23ec8328…

MALICIOUS

PDF

90.4 KB Created: 2021-07-20 00:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3c5224cef969e698d7de801f92a0932e SHA-1: ef51ea16d174e738fc04aa8429c1c86481022809 SHA-256: d1f6e40c23ec832804cf3e276c5f874de36647eff1c6e9bf17027657bd70d322
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. While no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect users to malicious or phishing content, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/c8fcf22pev3o6u7i2358n3orun/1618721955.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8d3885ff---pinudiripuwegetapu.pdfIn PDF document text
    • https://vestol.bg/files/file/28854565447.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/mowoforeju.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ccbcdc1d307e9414595f009f21f22c5e/65677287447.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8f33d530---nelututexolizuva.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/05q7p7kthqbdgecdq3io8q402a/wegutamu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/tr3ds2b1qi3m9kg4cub4bj2ceq/29352190497.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/f7fd8db02a185582b7773a1ee87c5983/nekapabixidusisabo.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782f96da0cf---salijut.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a0eb13cc38cc48b287ddaf8afecccf89/33115425288.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/patanotatimijavijetawipij.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c619269a814---27540707855.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944820e50da---talipemogudiv.pdfIn PDF document text
    • http://cocoal.com/uploads/file/gopenosonegirenizow.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9ns9l3tts6gbiu7gheaubkor2n/43310408847.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/61693746512.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/giwisimiwowisasukilot.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/71640324752.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/17608532286.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076db3f40da7---65309634699.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/37518932038.pdfIn PDF document text
    • https://argumentua.com/i/file/netegarajepixafo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ac2ba7afdf1ae99fe3ba9b6a70f1ae55/togovirikex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=2nd+standard+evs+question+answerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 17160 bytes
SHA-256: e97d6b6dde7e4bfc15284f275af3ef7068490493494f6e8da8b587f1d0e30748
font_01_sfnt_off00012bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C3 10616 bytes
SHA-256: 46a9aea629bcd4928178c7ac02c066a820419820be68f720072b5a72e9dfbfb8