Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f5a7ba6725b788…

MALICIOUS

PDF

64.4 KB Created: 2021-06-24 20:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50154ee4d8b31f681013b4aafa2078f1 SHA-1: 770a314c4f5cc9cbaf8edbb2eacb5c26247d9add SHA-256: 63f5a7ba6725b788dc65219a174c65799c0a34ada3e25df41b5c799eb98fbfb2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=questions+to+ask+internet+friends
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9a7bbcad0efcf105ec970c0515545750/84885145487.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63024c173ff424655f2c25f4ebc63d7a/rosokexubomexe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984766a3b8e---kakugasiniz.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/462290be65d91a770957804d81f65d7c/zuzeduluxogoxaxazekijela.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070d12450721---22738942657.pdf
    • https://amd-export.com/site/upload/file/90099207565.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a5713976d---44770234427.pdf
    • http://acmemask.com/upfiles/editor/files/pofekodakeded.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f3e6ae64d---39504711036.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609adef96aa58---kimirovajuveludasoli.pdf
    • http://altelaw.com/uploads/image/file/98437067661.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c999bdeef7---lafutewinigetugelezemeted.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a31a970499b---lozubewobi.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a0ea8696ff8e240e7e0bd42984f956e1/paxapapejixowopevi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0d7.bin
44a453df989437a73d200aab37060c60ff65c4d908078c4533134e52e1c733fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D7 4996 bytes
font_01_sfnt_off0000d1e7.bin
5b9f8e4ed49bce4a56981348a174436f742a36e4c316b48a4572833ae80f0067		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E7 10588 bytes

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