Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9c172fc2cfaab1…

MALICIOUS

PDF

83.9 KB Created: 2021-08-20 13:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2ab931a044152b3bc9e12919957c28d SHA-1: e31a708d0d1c279c13ca4fe056e071bf4abea318 SHA-256: 4e9c172fc2cfaab157bc77c470e8885cc75b65741240d397bf1aa34c69bf6256
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 ML models and ClamAV, exhibiting characteristics of a phishing and malware distribution lure. The document's content, though heavily obfuscated in the provided excerpt, is identified by heuristics as a social-engineering tactic to trick users into installing browser extensions or updates. This likely serves as a pretext for delivering a second-stage payload or stealing credentials, potentially involving embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=where+can+i+watch+the+movie+it+chapter+1+2017+full PDF link annotation
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/nufosuj.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/suwutezowipejeg.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7425a699c---52928279141.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/46d9efd18458874a577fc4ed3cf3dc42/96529852235.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd4888374---9419951276.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/u6d2153fr5dasu0490b6kgkm34/92673727200.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/65122906574.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16079011c525b6---gemafesozuju.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/kikurigozazef.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845e3d8418c---nimusoxaxoju.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c247f0e21---83324025438.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49dc4bf3a---71424996275.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/41342146439.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/23208321705.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/83224206300.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f5575a6c---59571971347.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/nokekogitevinij.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/lukiniwediwilog.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xutoso.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/fijuniforiwurenoki.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f295a3ab5---tupejusumoxu.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/2409468621.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/pevejew.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_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 11164 bytes
SHA-256: 2b15a1218a472a4ba33eaefb3563cae3d8b46f3d77eff97ee91647da751b0720
font_02_sfnt_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 17436 bytes
SHA-256: 1d73c43adcd9e904f426358034b1d811e7046ea1bb7c36833e534254e6663844

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