Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b0b1df44b274cf…

MALICIOUS

PDF

87.5 KB Created: 2021-07-18 23:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37e61b6d5f7234b9b9a10ba10c880e5c SHA-1: 5d7f78a93e4b66682c27314b8d57621721ac3b8e SHA-256: 78b0b1df44b274cfd5407bddbc5399ed6f5920a12c18a644dfe3a3c992671ea9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a credential harvesting lure. The document contains numerous links to external sites, many of which are hosted on compromised WordPress installations, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The presence of a 'SE_MFA_LURE' heuristic indicates the document is designed to trick users into providing one-time codes or MFA approvals, likely to steal session tokens or bypass authentication.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • 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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/0nj2mps1i2qq8ehvr0jb5h5qtm/sisedaxotuwinudeb.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098164163a0f---33825891156.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b36e2577f---12914941673.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6a78c386917f6e2e3b1404c69bf40bcf/ribituxapaja.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/70740d1c78b9c92f53e508504fcc5099/26320846408.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/wibutufe.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/viripabejuxurojo.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a799cde21a2---gesodajesoguxamaz.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607178d77bda6---gezudidawavukuxevekuza.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zizimoxurebe.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/bdd2jqn62ufeqfbduudfhs10e0/89585767265.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14837885db---buwovujoxelaraf.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88df42b97a---66431457071.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925cce5189e---tiganalapakug.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077da9ae60c9---50230830771.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/bf83d8c819edc3aab13dc96414a9a9b7/76027563336.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/25153745939.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1083b94b7---28312404677.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5a4088f7cf57545f22fc4ac828ed7001/44989929371.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc1408d8d---53897996157.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078029a3330d---8881059604.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/30241566413.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/dipepoturaxokufudofeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=word+for+love+at+first+sightPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f872.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF872 21760 bytes
SHA-256: a13abd80d2adf6f4b2c025dedb27711ca1b48646d2cafa47b30934cd63d83ef6
font_00_sfnt_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 18744 bytes
SHA-256: 187bbc91afae244f33197ee87837fc45667bf23f95bcbdf48a796c9e8a968d5c
font_02_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 10588 bytes
SHA-256: 3f5d51bd6c1939dafafb4949893578533f72a2a8351bbcc77c26cba1fe6d9f57
font_03_sfnt_off00013658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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