Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db921b7dc60f1bf…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 07:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ee38c379821fd9151eb1f9f37190b7b8 SHA-1: 9f4d957820ca62bfe40fa86188c2e2b47b934738 SHA-256: 2db921b7dc60f1bf519b88393b119dea58fc09aa9fb3a806c3d8c721179513b4
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and a machine learning classifier. It employs a social engineering tactic by luring the user to install a browser extension or update, a common method for credential theft or malware delivery. The document contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm used to distribute malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://crewmak.ru/uplcv?utm_term=block+a+site+on+chrome+mobile PDF link annotation
    • https://barcelonamedicalcenter.com/files/galeria/files/44890878392.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/genuxozitafedoj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7a7bdb07---gosojagujiwigatawuz.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/71824410285.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/tomorogaji.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/49453891248.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/65779720158.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/dejepogedilufufati.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48591e619---xekefedikofusiravusu.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/35116793723.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/pidaxodomedatililiva.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c53bb346f---govobavidomu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc94417274---demoramiwawagavilexo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16089a3cce569e---67795442050.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b29b4aca7ecb25215f610302fd50a287/rarug.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/fujibumutojagabugaj.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/27295ef59cfa0c5c8c02af7d8aa9f8f9/24766946061.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/govofulum.pdfIn PDF document text
    • http://lucann.com/Upload/file/1692477789.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd25c95bed---japosekije.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ba29e560625862075f08f4d7db2ed369/tiwakatidukakasutofokafup.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/jugijuvejebubotur.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16082a3641d348---musotujolopekebagosinaxi.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 17096 bytes
SHA-256: c1e3e4c96e1b0f8207caa5d943d4e1086451bbec4e6084e0b76056c5b02564bf
font_02_sfnt_off00013378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13378 10780 bytes
SHA-256: 53465bb7323641be03d8315a8625f0428d6620e312ee4a69e1b04bb7bd90b678

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