Malicious PDF — malware analysis report

Static analysis result for SHA-256 83910f697bb79cb9…

MALICIOUS

PDF

62.1 KB Created: 2021-09-20 05:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c0f79b17ab40be1e9567ccad1ce0fb8f SHA-1: eb1605632fba49e4e430c56a3136a29c96770abb SHA-256: 83910f697bb79cb90848d57c4d49b7e55aaa897a53095b0ba2c86d737e974c09
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7597

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.
  • 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
  • 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://abwhopewell.com/uploads/files/dilojejivejiluse.pdf In PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/37849936058.pdfIn PDF document text
    • http://thongthien.vn/upload/files/zojixopa.pdfIn PDF document text
    • http://elskenecologie.nl/files/19013665501.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/733716676.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/tedek.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/7vcr8r5i5e1o52jki2oi0h65dh/dobuvasopatubasoda.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/46233241874.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/xurozamanolekotuwukab.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/botel.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/34224219658.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/57275658875.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/mesexigufor.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce7a7a427f---37258307070.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/14889239501.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d61f2a99f8---67983107656.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/85930790098.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/40829626045.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/41626846586.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b859c32456---fesifezotoresimuwakip.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/lokosumuxanevuxamovovan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+send+a+group+text+on+android+without+everyone+respondingPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/49595251799.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF4 17712 bytes
SHA-256: 9baee5c44d347bed90fb6c78bc7df8cad6f4fca4ae2edefaab2a6d5670196b94

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