Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bf98a2607aa3e8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 06:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc0e611573582526b7c1438dcb2a8a72 SHA-1: 79618926ccb79cfa5ec121ebdb46317ed2800c65 SHA-256: b7bf98a2607aa3e8c2efa61fe0feb0705987c2f5a8cc99fcb2d03e5c30576920
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://altaprecision.com/userfiles/file/wubutavadasefipajon.pdf In PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/fafiguwemu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/er24kfr24t07eafiuij7f1a0ab/87747311255.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/xobomidajeweguzex.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5dfbc02a9---83480355689.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/zizogev.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/69199e5090a491924b83e0f110b1aa24/wanarobelefuba.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/58120848669.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/63104445239.pdfIn PDF document text
    • https://tcremich.lu/files/files/sidiwenig.pdfIn PDF document text
    • https://digireg.at/upload/56258550574.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/zoridexuga.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/71504954009.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/85276707875.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/61895982908.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac11840d64a---8162245547.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1dovcc96qasss0jjnd5dqlrhre/vibiniwakivetotova.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/34967472339.pdfIn PDF document text
    • http://jfe.hk/userfiles/xorakibepibotebelijaxolab.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/a7fc4efa782c05c23429dfef787b97e8/jorenidosasagirarano.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdd34e4765---mugexajagilidibiluse.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1611a42bfd7591---fejanosanivizimuvuwewepib.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16253779470567.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/47633693870.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/jakupuwiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hafiz+i+heard+god+laughing+pdfPDF 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 10660 bytes
SHA-256: ba074d4e29e1bda297f1521274cb54ea9a7c990759f1c71740fb41d780d3f066
font_01_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 17904 bytes
SHA-256: 5004955e5606977f80a8b54f9535e0e14abb78b54490b6893fb56351b15a46a6
font_02_sfnt_off0001218e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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