Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e7bea8cadab7e4…

MALICIOUS

PDF

93.2 KB Created: 2021-09-02 22:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4909e822d3fa45baeb90c5f437a4b350 SHA-1: 5f9f31b60dc6808e6d060e027ac15da727862c3a SHA-256: b7e7bea8cadab7e40931b7908146339b4104194c31591e9c772b2b4deac7bd80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://nomylo.ru/uplcv?utm_term=nimesulida+bula+pdf+anvisa PDF link annotation
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dd17a25a4a1b0d9c9f48e2c09478e200/rarorevoxaludegul.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/rotovanotegisewekegi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/05f3e55097158f6f253c67a7fd844815/lodimoxalavofoko.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0dbace141034221a470ed94b15e42de8/megigilapeg.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/masesoniparuga.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/wozanepenupa.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/55699798103.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/99708241330.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa9f25ac5---ravasevajimuwijatapukiv.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2252a8e96582315e52b8b8448d13af0/94540386719.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kisobofizofikamolabiloz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105d5c86bb4e---nimige.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bf960040---wuwomadulorusa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca47326c39---mezugigerono.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/fonujarudexujuma.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe93ea3f2a---vepomupivotopofenibup.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/bamedasatiperiwuwoxozu.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3f3d45ac2b9008f4c237b7d6108feb63/vevadegukaludokidajofage.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c5366378445441019c84cf1f60d6bd3a/votutifejurit.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd484fee3---zevenadokitubipikufasix.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b6ae4432---womozewexug.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/vth6c2h4b8m3fgd3018ujg5ds1/1437335320.pdfIn PDF document text
    • http://rcmo.ru/upload/files/76844405004.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/795261854ee480ee4d867c9c054c3c62/8812247595.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/605f6f46f8066cc5b56fe1377123e123/juritikewiboxonuxofuxunot.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210514081432.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_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 10624 bytes
SHA-256: d6b3ba5cdcb37cfe0cfdc5c47f944603d0005b7acd47e3bb467f6948ccab574b
font_01_sfnt_off00011d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2E 19248 bytes
SHA-256: b65ff218bd32a9163804a3013ac5a3159675714ed6c125088936eb9f10b75743
font_02_sfnt_off00014eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1