Malicious PDF — malware analysis report

Static analysis result for SHA-256 850d6aa0a0d4acd6…

MALICIOUS

PDF

130.9 KB Created: 2021-07-02 00:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 18c2d673b15cef2acb050947b3e003df SHA-1: 02d8bc64f2c3a6a36f89b062ff19ca68a5f09e5f SHA-256: 850d6aa0a0d4acd60499cadcd2f77913f4f73e4cb58f7393079cebe447037e62
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure suggests it's designed to lure users into clicking these links, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4d30a72f6---dexafeg.pdf In PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/54621970b4ba506dfea0954321415f7c/pedodafufir.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/kasosolenekujuz.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083826dcbc76---filusizo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16092362c08d3e---vigibejaxakon.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/vd015kk6aek4vepd4q2bjaj9b5/kowuxugozitaxewudopipol.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f859194573210a831e354aaa16526f9/79691416930.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/zuwesasunitulix.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d4bd0156---kimukazomopax.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d197f0d07e---23689629071.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/22474068757.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d27098dee---marivuxuf.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82da5a07c---73767485765.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7f24a983403c9ccdef858f7b59058d0b/27966025966.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ddca42aecdaa6111fdec89e04195c27d/84069746941.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/buxanamezu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c61445e02f0---tikesodalinigixuko.pdfIn PDF document text
    • https://dpmceramiche.it/file/suwitofatexu.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/85236213229.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf77e38a81---nogomazezejizosagetaz.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607211234871f---57485902722.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/7fhif2sm042a64ren96l11od88/sikilobav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+type+of+delusion+most+commonly+seen+in+manic+patients+isPDF 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_off00019d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D31 18280 bytes
SHA-256: b5b1e319a9c6e0388937d1d7537f6cfe7f3b818b3d632ce573517d4b9829a00e
font_01_sfnt_off0001cc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC40 10960 bytes
SHA-256: f8d13c8610e4fc50bad1fc605aa1c2949077203d727452bc318dc8ea75057699
font_02_sfnt_off0001e585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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