Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fe50fd3662a8d6…

MALICIOUS

PDF

74.2 KB Created: 2021-06-10 05:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecdeef4e4b133638ab6f761394f850bb SHA-1: 16564d5fe17ee2869f2e666493bcf84128ed0de0 SHA-256: 57fe50fd3662a8d6cb8d204b0e7efa219679d5bb417e26d6a8e55d71bf393c56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable hosting. The document's content, though heavily obfuscated, appears to be a lure for downloading an application, indicated by the presence of 'Thoptv apk 41.0' in the metadata and the numerous links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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://ketchas.ru/uplcv?utm_term=thoptv+apk+41.0
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc7de92834---bufevo.pdf
    • https://equantumconsulting.com/files/files/86478745476.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b7da1ae03285fa5ec666476395c5e951/koxegikemixe.pdf
    • https://deniz-sogutma.org/img/userfiles/file/zetirojitomelosop.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/ligogowepojewurolugur.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079747567e9f---befabafolamaloxade.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7cdd3ba5---neturebin.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/289f14d8e4052f4bdc6a565da9c0d110/wipaxunuxurodube.pdf
    • https://alnahamgroup.com/userfiles/file/35782069095.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cb74834da---zapulararajamesikimidip.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090a10e12371---wupadurezijet.pdf
    • http://planetamama.ru/files/file/zepilurekaboleguxefokuko.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160708f2581dbe---84046605915.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ab9e2128---65593429866.pdf
    • http://bukharaatlanta.com/sites/default/files/file/fevopezodijilirip.pdf
    • https://nadamasristorante.it/file/xininitinidegi.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a778e039ff8---xunenataxefoketizon.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_off0000e8a8.bin
5217d37f91f29c9b3d1a1e27921c1721222c25d00c632d40bbf3144ca8a6491e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 4988 bytes
font_01_sfnt_off0000f9b6.bin
4c5ebe0f5282495db5e40ccbee7fe842437f7fb640061bf8b3d0462bf3994267		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 10196 bytes

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