Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27a67fbb9faeb8e…

MALICIOUS

PDF

76.3 KB Created: 2021-08-10 22:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8512bb09059d97191f205552b4c60c1e SHA-1: 145a55cd1996bf0dad1a8e537311b8b0ffc04919 SHA-256: d27a67fbb9faeb8e86ae87e6cb7032edb4218818acd3ad2fc24b2365667399fd
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and external links, with a high ML classification and ClamAV detection indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing a fake browser update or extension. The embedded JavaScript likely facilitates this lure by attempting to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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
  • 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.
  • 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://ecole-belair.com/ecole/file/vatavutulo.pdf In PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/57d11f47fad0764dea9ffba84983ee63/62025867907.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/31969e191cbd01d54774996a2342e34d/farotalemikevubota.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/noduzewijedamatoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c88d863e---65202642927.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609b47296b7e6---xukonidex.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/334a6ed6cc68e939fe0011d053095385/bokuzexi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/mu35o2k2dtnangr2k5q2neid97/xoderepaxivetevasexojomem.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/sunufitafo.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/bexinelawekexivo.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/busak.pdfIn PDF document text
    • https://tempegaring.com/contents//files/93864606205.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160aebebc8b14e---jokosedokosivi.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a0b5a4aec92fc58461b4636a54a9774d/pobokalazatisulufofe.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c168bf7f---46222588292.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/40180710030.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099159f86ae5---sobarebebezesokomedogomu.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/sazotafore.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf962947813---vusodegekebixegujira.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf05235cb---27972203105.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/58141224317.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/39249600373.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/29442810859.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/nokuxukeguzufepu.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/kilulasuvomegerokexanejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=modelo+de+pr%C3%B3rroga+de+contrato+de+alquiler+en+argentinaPDF 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_off0000c5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D4 10900 bytes
SHA-256: 4487cd19e21db410c89bf37464677c76a7cd7356be9d32174145d95105a57e07
font_01_sfnt_off0000de5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66E 16972 bytes
SHA-256: 55280804f51ec7bd201f2e713c7f1def92de330f6b0f3dabfa5eb7a4a0f58756

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