Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca470a48bedac8f…

MALICIOUS

PDF

84.9 KB Created: 2021-09-22 09:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 15d4a0937883848da1fdca8d874d726a SHA-1: 8d05490fa8e3299a141baf0d4644ee2a2c9b90c4 SHA-256: 3ca470a48bedac8f217383cd9bc4d6a6c5c404d8714654ce4774731853391c2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The heuristics indicate it functions as a link farm, directing users to various compromised websites and disposable hosting. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=loki+watch+online PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c6daddc8---kusabenagonilulokad.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/reranu.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/76864373640.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/34886588036.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/07c3dc48e122d2c19f076908e2d24c9c/33873837339.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/26373036165.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/mitinuguvosukev.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/49644405319.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/58751643039.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/72798243967.pdfIn PDF document text
    • http://haki.vn/uploads/files/67597231343.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/92161647291.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/f24af0de67850157339843c1e0789ea4/70462851616.pdfIn PDF document text
    • http://fteq.ru/files/file/81600741392.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/23979562498.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/77523590472.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/jexilifejemid.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/nezerunipiropoz.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/11260271731.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/54641491524.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/kezeru.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/07/42392668075.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/wurenodibilus.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109192127011811.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/nuxetenubinurenezuvatoraf.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_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 18448 bytes
SHA-256: 42da741585e3ac2298b45f19740f4ac7248b105ea35f26e24c227fc15d50f3e6
font_02_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 10196 bytes
SHA-256: 38704cf163c224b08df397abee55b55c525a382c5f8b423a389897abed6cc539

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