Malicious PDF — malware analysis report

Static analysis result for SHA-256 7869cf33cbb7bf5f…

MALICIOUS

PDF

88.7 KB Created: 2021-08-02 07:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a71fccf310cea63ad8436bc527eaa03b SHA-1: f5c4e9e2151a6f148efcc3b021a14c16d6086f9f SHA-256: 7869cf33cbb7bf5f7a556fdb7606057f86a4599474ce75ab718caeafd5a27081
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript T1190 Exploit Public-Facing Application

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a lure for MFA or one-time code harvesting, consistent with credential phishing. Multiple URLs were extracted, some pointing to compromised CMS uploads and link farms, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the heuristics strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://rayanchem.com/d/files/welonolisefevi.pdf In PDF document text
    • http://mea-travel.pl/userfiles/file/zopoju.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/79394239918.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/paboxinalonodigukape.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e132b94e8---14605749684.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bd2492023---vebojesifapivikosabevaxa.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/439b39d4acf8ff637c69c0cd09998890/vibamedix.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501204722180.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccf150fc73---26340000279.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/22594448165.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/59118819324.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/lugamaxuzixorux.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ik7pc7nerpcgrp4aocs5o7i932/13534549417.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/72631256155.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609811ad8ae70---92935523070.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/55619843110.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5ootibo1jfg2652v5vdlvhlhtg/29462075958.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/fejep.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/bvo1jhrhcqg0u2p1tc2t3ed37s/lufenubutesujo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d6c8fbede280aad1789a7a5e02a796a4/61576808387.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/zutezuzenopudo.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1d133a36b1fba1b8acac0d11e4619857/19115018191.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ppn924jjrd68fooksv4gvchtu4/76417715189.pdfIn PDF document text
    • https://kristinanamaste.eu/files/tazufebugibofod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+activate+a+usaa+debit+cardPDF 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_off0000f88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A6 10596 bytes
SHA-256: a34722c6a6750e6b78bd22fd139a192309a2ef19ed71af65b402bbd827aee72e
font_02_sfnt_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 16696 bytes
SHA-256: 3e76ce169258bf10dec564859c307fc0a7c36907f6218b9502def05459b05171

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