Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d14fa3e6523e360…

MALICIOUS

PDF

89.2 KB Created: 2021-08-19 17:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d588d2f4ad5bf48f0e1e542e0d5bdf44 SHA-1: 21763dd4ff13f4692b8dc8448945952ca3d2181e SHA-256: 9d14fa3e6523e3600b462cdc50dc40a328148ecbf2e79818770f28146685fec2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous links suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 http://beateromer.com/bilder/file/tobasudibowisajomawe.pdf In PDF document text
    • http://oreoltour.ru/sites/default/files/file/jopuxekuwidokobagudikif.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc0070dace---10609299756.pdfIn PDF document text
    • http://sun-eko.eu/files/file/vewavudakanupidotenebe.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/luxetobasolenodudujidez.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/59232389741.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160830d6e55370---wozazerizupexejugir.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2e4fc207ccd40edfa578f686c5474f3d/juvukivanixi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/992b0a685ba9ba0ca698b14a473d47ff/32928950524.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/wamarifepaxolevexonet.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/97158401122.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0c72481d6---tebegilerowulisuzumafedes.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/95379996321.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098a1ed94c16---99880536785.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/wenudirizo.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/36967652743.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gipipatofidufowi.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/p1nfcelo0r3p3bo0e29ahcf81k/11165913258.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ba25eea34---29011435112.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/46219245564.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/25777314290.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/prlfbqj81c8b29okkc5hfv0kft/fijusasaxiziwoporonudil.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9b2f0a912aa7d4af5fed5ded5d54f012/80004772574.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/68614093671.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/49429575125.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mpbk1jcsurbim7chgas5l4e4q9/dozamamatoxijagezuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cuentos+cortos+para+ni%C3%B1os+de+primer+grado+de+primaria+pdfPDF 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_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 11252 bytes
SHA-256: 682e9df742b71cf564b1ad4c2c6ee27370196adba5b68625f68d8fbecd723ad5
font_01_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 17812 bytes
SHA-256: ce6877fa4fc08ab1cc4bde6372ccf4336f77776aef57ad12ebc33cf980392fc1
font_02_sfnt_off00013a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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