Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6cf2f86a9a0fc9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-07 07:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccd020aaeb5093fcc17fa1f8ff302a05 SHA-1: a0e61a55fc6525aa7efded4319164a4e12a0388a SHA-256: 7c6cf2f86a9a0fc919c8b8d62b1f9205df434c5a3964d83364f545e44df19062
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://tselectromechanical.com/uploads/CKfiles/files/dutupimazotirew.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca705d7ed6---77395443987.pdf
    • https://riondene.ch/img/uploads/file/pizebabosasa.pdf
    • https://atrax.eu/userfiles/file/55501387510.pdf
    • https://egokituz.org/files/galeria/files/32571770235.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d09e0d4b---68892451606.pdf
    • https://webtechnocrats.com/upload/file/rijumama.pdf
    • http://partner-support.net/user_data/userfiles/files/10842462877.pdf
    • http://villabrown.it/userfiles/files/33336224750.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160775afd07313---tawupijaguwet.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a458a869638---5671506690.pdf
    • https://daquin-ferriere.fr/userfiles/file/vigopaxusubojutaxo.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/03852pqah24gdlshc55jsm4tvd/regapalajobosolupebijeso.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160775af0f2d64---56925703212.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966900a4b51---kesavakasesogodepas.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070319758c0f---63846473091.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/befigijog.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a1e2a316cd05bb0ed36e536ec7d5d9a3/munigemaxonipilirinu.pdf
    • http://cissi.it/userfiles/files/65335780976.pdf
    • http://karpatskiles.ru/store/file/842232612.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de8afe59d80---8920604556.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611b711640a46---22116977170.pdf
    • https://aldapa.eus/files/galeria/files/polevexalov.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sowetan+news+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c666.bin
91b8f63746feb36b1ddcf125f663400298df5fb7b49e868bfdf6f32450165afc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 17572 bytes
font_01_sfnt_off0000f42c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 16792 bytes
font_02_sfnt_off00010c43.bin
98ba2027fc8ec024c45a02fbfc3dafe3eb943a514dbcf8f244ff8f5411d49938
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 10412 bytes