Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3200f442c46e25…

MALICIOUS

PDF

76.3 KB Created: 2021-06-10 11:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 90d4ced0e13f2d11ae9015f2414ee388 SHA-1: e7f57311d793cffc9f4e981a87e9916e4c115add SHA-256: 7a3200f442c46e252497ed6ebaff7f7807af0d589e9cd8b1568e5b0111b45ca3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to media content, likely to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9065

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://huntic.ru/uplcv?utm_term=cinderella+and+the+four+knights+ep+1+eng+sub+dramacool PDF link annotation
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744d22cd09f---23070702922.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f9bfbce78---nunefokem.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081d848f0cbd---mazogawiteritiviliber.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/dawaxuvujofami.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f89770ebff46bf6bfecaf1f966147e42/6097164781.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/28830388007.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/98195221262.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/68250472765.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/abac6cf09ae8a8d885529af329658c12/18701562683.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/iamn1vh8geq2g3hvg9ecf71mp4/lagodegixo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d10f8196d---29945029542.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/131554421172.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/147d7209357b392a9ce1b37f8c3383cb/votafekajobage.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 6940 bytes
SHA-256: 2c6222084923dfc66a2e9782b307a0aebc5303dd49ac2b40fdf69d0d20ea2b84
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 5728 bytes
SHA-256: e577843a41512b767c2535107ad759cc65d548c3c8e0453a6f881a264561fe6a
font_02_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 10760 bytes
SHA-256: d5860bcea4756ad1ba78252d0f0f13a2940d943abd3f411ea79d97fae5ab5c55

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