Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d711ef376d3312…

MALICIOUS

PDF

91.0 KB Created: 2021-07-17 19:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8944f6c5e3d0664374cf9af2a2883a0b SHA-1: 91e8bd1073c89d90ce49ea8605c966086d4eca37 SHA-256: f6d711ef376d3312dd47c3cfa85a931390b3cc8e0b637d75bd8907dba62710c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and the nature of the linked content suggest it is designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3714151e---vadobogavupofikabu.pdf In PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9c6ac069---lojomoziluf.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/jukevugebalosumorugiz.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/3d57013ef7811dd3b8d7a51d7d5cf5a2/zijomonozewo.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/suniwibosekejixuvanalivi.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/fozodimenakalanuxizakita.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/kobagudi.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/65ameehm7bh1v81n5mt2qa63e7/dasekuxowasawovi.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc36b3891---daxesofuvun.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/129b60c3bc2ea472f1e537c410eca478/xopesejixudivamigop.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/zewexabudazoxuzaj.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/28228819628.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lc0kstg0jfdq9nscsjr6a841s4/litoxuvekite.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/366c8946b8167c1b08507d8039c3864b/24906730048.pdfIn PDF document text
    • http://grandchainfamilyfoundation.com/clients/85333/File/43896807487.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b73e78dcf---najigavapibiragenifupa.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/4505ebf467c3674530c9896213bbdf2c/wogujofo.pdfIn PDF document text
    • http://szpk.hu/_user/file/84045788478.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/711c2bd0459c2a5bed48b93b9c58e6b2/sojebagikubi.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/6vkvuvm1njq5ga0g62dqe85687/rakuxudimuzepufisiduwusil.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ovn632qd4eigeipqotvs3li752/fusudefidivolapasixeti.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8f2d6ae0---fonilitimavupidib.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/2755472837.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6ca9be6c---sopodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ing+suffix+meaningPDF 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_off0000fb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 20624 bytes
SHA-256: 8c229076f908feef7ac30900b4103356b75f91d55d6d4d7b08477c622d94299a
font_01_sfnt_off00012f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F72 10344 bytes
SHA-256: 6c3e52a2ec321fdf3d855bf77cb3d988a4c8e71a17fda9bcb2dac6c342378836
font_02_sfnt_off000146c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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