Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74572a0981bd803…

MALICIOUS

PDF

105.7 KB Created: 2021-07-24 07:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 53871987ed08c8f4b7a681d5c607650e SHA-1: 610fc22bed45573ab93d3f40a0fb0716d834483f SHA-256: b74572a0981bd80312f4af8ba69110660bbc153fd86e59a2af646d8431550f75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs, many hosted on potentially compromised sites, strongly suggests the intent is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68b2afc7b---3505712475.pdf In PDF document text
    • https://dijitalsanat.link/upload/files/79109455856.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/13558718084.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c416a15d61ef986d618a5aa29c0a6cd8/77903493994.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/557eebf6d3e424610800bb7a06d285ea/92437444743.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/nejizixutosonafigi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607014e0a2acc---xadajiro.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160df042d62556---70767857986.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/29545933637.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/94463450958.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fab753fa8---zedipugiweliwuvami.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/vuwegakuvoxakuro.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/masis.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/i6112d3tm1vofl1m4vgliui187/13273470453.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609592f9ead93---lemuwezo.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd29e23004---11479089622.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d6c40674c8c86b3028035dfc83c2dcec/dogitaninejabevekewegonof.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/82707914223.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3bcbe25af0f9e0ba59997808527061ac/gakoreno.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f4ejjtjb5cfquh3k66b9ldtpm1/58573947526.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/47371987556.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/laxaxadeduja.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/7uannstkng2h8uf9av6cr2j4of/36169313855.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3803b1503---zaxafewokedub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=what+are+the+3+limiting+factors+of+photosynthesisPDF link annotation
    • 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_off000136da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEC 17708 bytes
SHA-256: 15eadadfbadec7f6582fbc065a853cfdb1ca81c41e3ec22077992d6dc83e60c5
font_02_sfnt_off00017db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB9 11208 bytes
SHA-256: ca58e7b1b2923810770ba7037b9ea4dc7211475e8ee8b30d629c6ef6811bbf57

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