Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc16e245d57cac26…

MALICIOUS

PDF

97.2 KB Created: 2021-08-18 13:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 891caf9a7ef0326b1d1c6441dfcd100f SHA-1: 4889c26b5e8b8752438bc8764eb38facf9436a24 SHA-256: cc16e245d57cac269f81ad1830c53ef76a615e6893202b4585fe180b35e9b4d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c618ae073fd2e52d432fbe43e0344b56/93086236181.pdf In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611793d270cfb---93654905924.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/72377922324.pdfIn PDF document text
    • http://crediramasrl.it/public/file/valexonotoruguxaz.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/kojosofodiko.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/55415931008.pdfIn PDF document text
    • http://qachs88.com/clients/58271/File/wemotirenokigen.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c92e2a8d7d37e973e7bc24fea34fc077/86500130408.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/oqpcqthpom7c89mmhk8rg852qv/9437948799.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb2c4f089a---34894429680.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6b586f57---kitamomuguxafupomivu.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/zejimibugotij.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/7e471c1e0r7bcncrlv2a9blmh0/gigasaxedarivotosunip.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/bunopanere.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/bajekozon.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/fevafezelon.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/009ffe82154726e700dafdf8c137f99e/80524615073.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/8tevijlbdklg62mi56p52ejusj/zegidikaxilazuzuninamofo.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/85865491382.pdfIn PDF document text
    • https://latework.cz/soubory/72343683702.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/fosofaj.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/vgo83sid6ors3aqgppa7bu4mt9/7540551461.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ug2j268blkh68g8jb82s6rt6a7/44254072736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+much+forthglade+should+i+feed+my+puppyPDF 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_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 17696 bytes
SHA-256: 0811b13e4873d84862f5f0a5a38b59a1495578401272901779a7fbd331cbe617
font_01_sfnt_off00014334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14334 11252 bytes
SHA-256: 25c5b6fd8edea5f936de1a7c7fdf556260c479f7971a5fdeaddaf0a9cb7233b9
font_02_sfnt_off00015d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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