Malicious PDF — malware analysis report

Static analysis result for SHA-256 4facdf96ec4ee95b…

MALICIOUS

PDF

108.7 KB Created: 2021-08-10 21:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: efcf799a7b2cf685870a6d38e7061bca SHA-1: 4ab1a0b0c5ea2ba9c86d9de37f318a56a0fb7a01 SHA-256: 4facdf96ec4ee95bd01dacd08a410d9a99d53f48ce7ead76cf3d025c57766ade
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a social-engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for credential theft or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a dropper or phishing lure, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://www.fashiongale.ro/userfiles/files/44407173878.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/7b709d48f4d664c861b8951fed3e5856/duvatupodigebuvedime.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/nadefuvudizediwutubafipat.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/48114240118.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4662fc4ce3b7c0a4ca8d4aa14be7eb3a/33523062544.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b522029c4---gobadomukirogaxevugolime.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/qpkkubuv95qqu9d94gr2d42g1a/kigikowepasamupu.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/xefokifororusigobufetu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a25951bf1---lakujaluverikapu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pvgmgjcheblvve2eh9soolepeg/66786884585.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/22958086458.pdfIn PDF document text
    • http://mav-auto.ru/images/file/2931297155.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/tuwakifiz.pdfIn PDF document text
    • https://t2sc.me/userfiles/57252203696.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073adee8da65---dixiwewivedofe.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/22485702306.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/53150582132.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ea58b9fb0d6b9949e0855e7aa47f3cb6/sizosezisidiw.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/15224203179.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/21923411786.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/xumezivirekimirabagunos.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/a0642c8e9c2a2e976c8bc7685007072a/wanimu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adb0a140b2c---kolilabedenugop.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/7a20479dd84413462c8e663ef60bb290/paxulurupebol.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f84c4fe58---72712906101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=call+of+duty+black+ops+2+zombies+mobilePDF 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
font_00_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 21440 bytes
SHA-256: b3d8d28bafccc35c4d201116bc8bc60991a1d9c3c55b2d828d1f6dcc3588d366
font_01_sfnt_off0001567e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E95 11232 bytes
SHA-256: e36b498d82e4ff53705cd5268d3daaa19f59cea78c2c097dbaaeddfeaa39322f
font_03_sfnt_off000188e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E7 7872 bytes
SHA-256: e4638980538512b2a468e3066f16fab8b2f8391a16d0eee847e81ad4eb5eed3c

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