Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25cfa661bc2f792…

MALICIOUS

PDF

88.0 KB Created: 2021-08-12 16:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44daae45db3fbae50bf14f6ec360a077 SHA-1: e6aff18117af069b3614a697ef9534a3c9893c4a SHA-256: b25cfa661bc2f792d77e6587c62845f4aac8866ae0e4e0ac26c3cb26320ea57f
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and malware distribution lure. The document prompts the user to install a browser extension or update, a common social-engineering tactic to steal credentials or install further malware. While no scripts were directly extracted, the presence of numerous external URLs, many hosted on compromised or disposable domains, suggests a distribution network for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=semicolon+and+comma+quiz+pdf PDF link annotation
    • http://solmoda.it/userfiles/files/domevozaxagulinax.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/fopukapil.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/93c60bb0d8fd6f2c73c98e5a6b988404/rolapel.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/wifitulajaxezafaguj.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/41156459157.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/betemoboxidukul.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8ae088395dec0c1a7dae78208137016f/37510898416.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/58524461267.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/19081351775.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/dugimimunobukesid.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280823151696.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/rakupizimax.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/db95dd335048375f462899eb569f90df/85033313685.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/sonugemawugevijulad.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/2036342319.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/23090649279.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cfba80f384ecfd78b445719cf7d1fe87/gupove.pdfIn PDF document text
    • http://fygl.net/uploads/file/280913086288.pdfIn PDF document text
    • https://cecprint.com/images/file/54563894932.pdfIn PDF document text
    • https://www.casestilistas.es//ckfinder/userfiles/files/jalinofim.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb144ae0db---76272643853.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/dewutuwiw.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/25447077131.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 17124 bytes
SHA-256: aedf902b6d1b18cc2f95641b5d478d2b30b635c7a8fc7515cdefd394fd752dcf
font_01_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 10796 bytes
SHA-256: f1bdb91c0f94f5f41a02c5379fd92fd681fb05dca48f85da4c8248bd1ff8f315
font_02_sfnt_off00013aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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