Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d9f7641d43f77c…

MALICIOUS

PDF

103.8 KB Created: 2021-08-19 01:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59cc20312312234bb265e9663a14017e SHA-1: c8adb3e0e18b30a1eb740060c00821cd09dafdb0 SHA-256: 41d9f7641d43f77c322c860955014219064e8657c0f390aea5fbc3804f292984
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. The file's structure and link farm behavior align with spearphishing attachments used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://avgdesign.com/userfiles/file/xopuxobelafa.pdf In PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/7313ee9db430bec4d4ff1374b443db1b/tifekozolifuwodo.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/fixozumenim.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/woliralolazeguguxinomeros.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/sotixa.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/doziwuz.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843122008d---78317587569.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/rimarojufitugefow.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082f69d9cf1c---saguxiraneve.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a26f5d073a---6955953296.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/69a3913c02c212c7d8a3b56058c8d859/xesefadajipe.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/572d5397657be0c5af8084f25c816ce1/lazanewajetiludevewotokil.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceaeafebbe7---32406108419.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/bexikatexipux.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///38990969892.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/9560214946.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/94956176432.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2cb373d23e505aed3efc10d6b453cebb/mowerugimekumalakilunax.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607582899b723.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3885cc354c---58886049852.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9d82b634---80101213641.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/944cd51e327d991b4d97232fff3b30f5/madonisajabebovu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098597d00d42---39547919322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=alternativt+til+youseePDF 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_off00013046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13046 18324 bytes
SHA-256: c1225c3c14223080c1c92c9375b5739b98685ba349dbc3df2110752031d5afd5
font_01_sfnt_off00015f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000177b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177B3 10360 bytes
SHA-256: 2902e74c0c3737b2f8545b902b3a7fe0306842727dd536ddbbdf121a8c4d474c

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