Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c111e732ae1c725…

MALICIOUS

PDF

86.7 KB Created: 2021-08-13 20:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7130dae36b0916fbb50565517a9ed280 SHA-1: 471b1686dadb12f0cdfc828a8cd1776fbd21d40a SHA-256: 3c111e732ae1c7256ea5feff8d1e6e3f41838947259145699aadc341280fed09
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a browser extension installation lure. The document contains numerous links to external PDFs hosted on various domains, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the lure and the presence of multiple external links point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://viprealestatebrokers.com/userfiles/files/89813108491.pdf In PDF document text
    • http://attlas.center/userfiles/file/wukazatijodorokifarevuzat.pdfIn PDF document text
    • https://theurbanthinktank.com/files/bikokolatabeduwoguporaso.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/33289707984.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fa1c6935fdc2084d7435f1c129ccf536/sanedusuzadax.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/sobulenevibufovod.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/o4renl3cofejj1ds1p0584sadt/fekilugalodolowamugebuve.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/wesabitivuweterug.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf5a05af5---wolijuxagabilarijaza.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf27efa34b2---kobujane.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/27679226122.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b1bd2754---48576908078.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/25deac51b73e15f5a5bf127ce8c044d2/kiwonureb.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/38744498971.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/xetopofesafudapojovagaf.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/48074734979.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/varikapukozovafufagowi.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/30062745418.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/pejogatexuxaruladazar.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6e27b296853552ceedba764e77ee6c5d/84196692990.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/11285656584.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/fatemapinaxutav.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/xanegozefatid.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160825ec94baa2---65485083155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=google+sheets+daily+schedule+templatePDF 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_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 11012 bytes
SHA-256: f576fd8db7989054f0c01428c6e4a907a03b06e1b114c7f3955bcb31da22e2e1
font_02_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 17024 bytes
SHA-256: 6765350fa0262eedc8f9286f1c7c1dcfebba0692f9d1a17295b54b127f61d417

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