Malicious PDF — malware analysis report

Static analysis result for SHA-256 94886af384568751…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 16:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfbc39236490096b7da987360f7f0ac5 SHA-1: 65c22bc159b7d128953755fdde4bd6fe93e3f259 SHA-256: 94886af384568751fdb5297160c051178100cf1fc3eedfda96e60e87c29373ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern involving user redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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=pdf+converter+professional+7.1+download PDF link annotation
    • https://agmatbaa.com/upload/files/venasebarujobatomexipij.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202108190406412579.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/makowenutafememan.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/55793857810.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/69858513181.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8a58ef5a---gexim.pdfIn PDF document text
    • http://german-ex.com/57510422398.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/11848745677.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b05db102001---tixagefodenajasevef.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/21836088287.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad88669bdff---62240872474.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/98051816874.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/44242823835.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/v9au5l6lhdit0uq88nv8ipemva/64475944082.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/77537180515.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3e27d9b617eceb348d3ae50bc9ee4c68/mawugupipodesupajufesos.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/leferedejurewometebiwaliz.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/ziximefolisilorevovizir.pdfIn PDF document text
    • http://dzbnf.com/upload/file///66847514373.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160824dd8ccbf5---toxumuve.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b94c13743---pexaguvelivowoko.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/25153421062.pdfIn PDF document text
    • http://iltorg.ru/upload/file/37623011166.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_off0000cff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF1 17608 bytes
SHA-256: 5cd59172469b24bda9d693dfed9da083fc4fdf97bd737ce28b1256e6d0a7b557
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 10932 bytes
SHA-256: 3bbc69ae8fa0f7828da77dcdefe6566973174b65b2ef8d94a71f83650ecb596f

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