Malicious PDF — malware analysis report

Static analysis result for SHA-256 474610fd89df20eb…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 00:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f34ca7c16eb3f45309573bca361b4075 SHA-1: b33c165f9f00d9993334bc18c452016ca18585c8 SHA-256: 474610fd89df20eb242d49f2b5d17b5a8dda3aab41c4d1b3dec57c0bff7ba1ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=the+gents+room PDF link annotation
    • https://koratspring.com/upload/file/rifemominagesinutebabi.pdfIn PDF document text
    • https://grancom.by/upload/docs/dupotobomaxugonudafe.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1984166ebc---pexuwanusuvukuronixalow.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c61438829---geboleru.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/tozogafamexi.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/69455938021.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/wubuziwe.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f787ac95f48---10734854478.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/bc5a4a66cce5bc5a416a86b4cc07c91c/96328409946.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/6520966373.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/bawugesutikozesajefi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609142bd848b0---88155880248.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/70635507571.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/bconjf76b4i9cbdded6mfg4q17/88608579316.pdfIn PDF document text
    • http://sun-eko.eu/files/file/nometulalato.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad88d7bec---84629601332.pdfIn PDF document text
    • http://ippon.lv/uploads/File/kosikezijonu.pdfIn PDF document text
    • http://farashimirooz.com/files/sezipemuz.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/65778063884.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/55652540437.pdfIn PDF document text
    • http://dsraxys.com/uploads/juretupuwe.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/tevofudokenobudomod.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eea25493cb---jivakexagavonup.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5446eddc7dc44a0a54754648fd18e57f/61431833750.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609273ef6e606---29711009179.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 17188 bytes
SHA-256: 647e1f24f3c81624988137aaa4f9864604a75a3a5762a5e22b3d30fff0221f1a
font_02_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 10220 bytes
SHA-256: e16ac450c9288cb49f58109828ea9bbe586a812ee0195b17496df96d99300e75

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