Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf40c36d8680238…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 16:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ca73a9ee1ff4d2b29909eb0e8f584b8 SHA-1: b7e1730a71dfba8afcb2d44397ad0e1e43641431 SHA-256: bcf40c36d8680238966851a50a32c1bf5c281edbf88f9cfa0b75fce489b8b6cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs point to compromised WordPress sites and disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://synerhu.ru/uplcv?utm_term=scratch+programming+exercises+pdf PDF link annotation
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/zefowereloda.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/sopixosaforevikexotasobap.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/52888740969.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd333fa45a2---75915313478.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/p3bfudvnvo0irrk7lfoss82ch5/xetojokaxavuvevisufuv.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab6583c1ed---2948356782.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/lipav.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5b91606e3---76834196167.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/8146302743.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/duwokuduvuxexuve.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/farebajufezusexiv.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/netunirovuvid.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ada52b262---73780284659.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/29a2e19fae9a6c2cc01f3bcfe37a8936/geponipekajidon.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/surefasazazavo.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/23024745155.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a3f31362---52280094374.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ce5c17dd0---minobevibaduviwe.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/fanuto.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/loketidevo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6e936f0a---81541432912.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb02de5c7d---sijesukibuzegileke.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/biril.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/tetagenabewugowamovaruzib.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3iolq6p9fpl9cs5tohvm1cgob3/19678654796.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160832c7cb3812---zefozaduviz.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_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 19324 bytes
SHA-256: 4719f6afcbeb67937a1583d658711e4644ac0146d157f549714f53291f406eb2
font_01_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001284e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284E 11196 bytes
SHA-256: be0e4b299a3356cdc92ade31a71faea20686850390f64ca24bfe15a436a5aaf1

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