Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e03bdd2682bd443…

MALICIOUS

PDF

90.9 KB Created: 2021-06-27 21:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4015cc41c63b89be992b7502d08e071b SHA-1: 0c5d3ae339c80b2127359a37d9510bfc9f6db722 SHA-256: 7e03bdd2682bd44335928eaa44ec060cf32cf022eec67d4b382d67b8c6bfa96b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through phishing or by serving further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://robalton.es/Albums/images/file///vasugapenebovupakafokibe.pdf In PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9f017b33f470a2902e5c7eb5c629a4d9/zuzaxuvegaronam.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/34510409917.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/053dc86f82c71d4e1968dbce44542fd2/xatoxopulesimovu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/68d999e6f46b598340670650a8038202/figitozepeduguru.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/674792747cd1be18f24e459abfcf93ec/jevat.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16093f54272caf---30243698193.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/90937060615.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/vifuvovugexotewagot.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/3baqp8mrhpddq1a66fjejloebn/moragutowelugu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc075df125---lovofotopunubakufuxugu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/nitelesozi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7910ce39c567edc5e3f5aacc4dadd287/midisusakuf.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/lipusiwaxiweno.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a637e5c97c0---28159473394.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/63998690285.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/425435b26ab30917dc1c347c1b587eac/xiduzibub.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607df1e640887---puwugamopirixumatilezubul.pdfIn PDF document text
    • http://polkovnik.su/upload/file/34123527173.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/abe0bc6076d71c847a068bfed499d8e0/63074108673.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/satogovabokodevikaganozo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cda0a08fc---37940115335.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/5910405478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=may+god+protect+your+familyPDF 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_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11767 17668 bytes
SHA-256: f0d82c8ce9d12918e06e971a0ff26faf9422b2eb549ebe649e466dbb9110d41f
font_02_sfnt_off00014599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14599 10900 bytes
SHA-256: a514f0855a8870d0b5f4cb800f995633fef1fd1b3bf3d8525ee7c3d72b144d3c

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