Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b9ec6a65387a0a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 17:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df03d9433e9d415b393c456369f603e4 SHA-1: 5ba94c445e420acea034a721b384532da03a35ed SHA-256: 01b9ec6a65387a0ab4d51f31f6468251d7fc7ea1be759c21ca10e664706ac2ef
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and is flagged by multiple heuristics, including ML classification and ClamAV, as malicious. The 'SE_MFA_LURE' heuristic strongly suggests a credential harvesting or session token theft attempt. The presence of numerous links to potentially compromised or disposable hosting sites further supports the phishing and malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://biplano.eu/userfiles/files/96790175768.pdf In PDF document text
    • http://branpc.in/ckfinder/userfiles/files/27959509620.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/57205947638.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/518cac2c574b63848e9dae61d9597c8a/59699036618.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/71545560421.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/vetusijiw.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/64180389583.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/50266735404.pdfIn PDF document text
    • https://kaimano.it/file/29440762462.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/80664135707.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/87517206712.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/61cb33077d1a90d138e06b3bd6af8be9/muxubajakatejolesarapo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161312d067074a---zelalerexajutoxowabejax.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/zutuvugejubavesaxabi.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/makekuxugideloxusatelilo.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///fedejifivaneru.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/kozevawoxofepafugo.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b426eb35---ripulunejamefatuvamet.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/5051942510.pdfIn PDF document text
    • http://355353.ru/userfiles/file/37703845608.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388ce2ccc3d---zotovuroguraxegagobage.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/mevagulumitifet.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/kixexebojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+email+verificationPDF 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_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 18780 bytes
SHA-256: ebd1576f93191004fa057356f655b0dad35378c881fa95e8482d26ea3cb4195a
font_02_sfnt_off000135b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B2 10516 bytes
SHA-256: 580667afa2b81727225c51167c4f6d621ee0d0baf4533acad7a1a862e14531b1

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