Malicious PDF — malware analysis report

Static analysis result for SHA-256 727c1ba6fd2fc38c…

MALICIOUS

PDF

87.9 KB Created: 2021-06-17 00:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42ca99ee6f974f3a614f980d4b2f1c68 SHA-1: 5c55d43b070a0613da5a10d0908844f503889afd SHA-256: 727c1ba6fd2fc38c95696d69c0ca67db976ed0e71f4e9c5e4ae30d178499b1a7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The document body, though heavily obfuscated, suggests a lure related to 'Nintendo 3ds game roms'. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic of using link farms on potentially compromised or disposable hosting to distribute content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

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://irlanc.ru/uplcv?utm_term=nintendo+3ds+game+roms
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0b031588c---pepofe.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f500fa81---29621206538.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b390291da7d---nagenus.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a79580574---41791448479.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7c0b31815e326fe5d111fbe4e2ae7fd2/rujekajogixir.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/nso8ou5dfrapi4kj6gui9v8604/43796832214.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/211e01eedb2332d0a7eb8d7b67e3bc78/kenanasawasevu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb65650ddc---595297960.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52975d6393daea19de89ceb87f251813/gejif.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae687d502---nulepada.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/kedatexikerib.pdf
    • http://ecogestval.com/userfiles/file/47216918427.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa34497ae---paropinepurekujekarub.pdf
    • http://whatdwellswithin.com/file/taparilenozivulira.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42c2e7487---20031460911.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c145e255f36---20798889200.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_off00011ad0.bin
3be401fe54006dd5dfd5ea71a53390e90851cd6da80c71c0efa4f1267c211c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 5244 bytes
font_01_sfnt_off00012c92.bin
fb69d3b5f07a9bdf109810694486957e08421108c465e4ae34b7bff238926b2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 10948 bytes

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