Malicious PDF — malware analysis report

Static analysis result for SHA-256 192ecb9e34635e2a…

MALICIOUS

PDF

74.8 KB Created: 2021-06-22 16:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ccf578ab12d99538d940772480e34b5 SHA-1: 8b3621ee3148b028500424239e74802d2c967f18 SHA-256: 192ecb9e34635e2ab477ffc717b2bc4c7e6f23a92cf9bb674e6fb61e68b798c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, disguised under a seemingly academic topic. The presence of these links suggests an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=present+perfect+passive+pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5ce96a4a---belagadaxevejasogif.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b5681cf81---nupetavonu.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607653e8848d2---22114503423.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/06577bbc0f124960bf8819cc7d01911c/koporuvibageviwazuf.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba32b37a99b---zegezusemozu.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/9c54af12a0291bfa3815d8daa2347fcd/nexurilugulogagibulesed.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c9a96bef---koganujiwutafunem.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mhgfh64le7lh1q30d2va3skkhf/34629140865.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c706511d01---zubifimakizutol.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/98f5dcf3ae1363885bafbd7efc3652c9/36278774796.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ta60df16kjfi6uacesrcs64r05/lavegovawapawosamevulotak.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160853ff17197b---gafafereduzekikojuforur.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_off0000da90.bin
8e3b47c1193b490d48456258f7512916095c8784c72ded004438ce47928e7d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 5180 bytes
font_01_sfnt_off0000ec44.bin
a934195468326f095fbf1d312e05d6f90a84a5e5e5b8b0ea25896c65c5bcd3ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 19776 bytes

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