Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91f4f18fd1306e4…

MALICIOUS

PDF

137.4 KB Created: 2021-07-06 00:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 472c4fa31f6f76a8e5a537b43014d496 SHA-1: cc1b4322f1ed7a82d600f03c12654573ac9008ef SHA-256: e91f4f18fd1306e466ad31e8e409c34a671f2652cc27e9e201a630291b5f0b16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The document functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into divulging sensitive information or downloading additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9862

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=three+thousand+seven+hundred+fifty PDF link annotation
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/it57a7i40mtnln3sfqbte1otb7/jepuz.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894a318997d---jineforanizidodow.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/68321515225.pdfIn PDF document text
    • http://www.toptehnik.si/images/gevuga.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/guvipadixusedixapug.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/a6oo7n1ocg46ufki7pnpd4idi4/ralodiridekawak.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607886a01c295---3358584077.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7bf75d03f2582792d2a0fd32aa6fb011/43382687833.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160738b7ceb0d5---45041204827.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/64cs7dq963jetjb6uoivji0o1t/zaropasat.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160904488684ad---susimedan.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8399e1663---43467379392.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/19343220704.pdfIn PDF document text
    • https://latework.cz/soubory/pagalivo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/137bb87331a160e58051eeb0cad3d705/60178017683.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/najures.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c41d489c597---50797090599.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/76fbb28a2df400958c5524b7a31b4279/wowamudojex.pdfIn PDF document text
    • http://sieuthibds.net/images/files/99656896432.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/83190108798.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e4b423f5---45026460415.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c4c0cb0fb---tiluwekubepewirasar.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/32011252590.pdfIn PDF document text
    • http://ndt-ultratech.com/files/21169655264.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://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_off0001bea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEA4 17132 bytes
SHA-256: f8d565ff85231a3708448ca7d25da42c4d8bff056ad186624a366a84ff53dcb5
font_01_sfnt_off0001eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000203bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203BC 10648 bytes
SHA-256: eb670e8c6e357a5e9a843c713213e87a0b978386aede033fce55cef751a7da27

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