Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42950db5e6a0b9e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 05:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0de5b78b0990c07c7d6c2e726eb50533 SHA-1: c29f24b124bb9693b0e079f30ebb83b88897e2cf SHA-256: d42950db5e6a0b9ebecce2b4c2c1b65c4d8d5ae4c50cadf7c9fa00b92d2de8e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm on disposable hosting indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=browser+hijacker+removal+tool PDF link annotation
    • http://montazenabytkupraha.cz/files/file/fuxiwetosaguzikirokewiwu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/944b1ch1ni0gi7rgjup624shpu/79976914251.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c65e046da6e374cd3d0c005b53a13221/wejozerujipe.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609815d825d40---47379780967.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a2d87ee3---fupuradoduwetobugoza.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160892858a6474---radujesomozizixagexoginuk.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/rivuvokawonisotareje.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/vozumexotolixewog.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/ladosuwolu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a04ae956---lokewovomasa.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3ede1c77e3ccbf30b74dbe649c46c0dd/76729740107.pdfIn PDF document text
    • https://rintrans.com/files/17599171542.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/26739949056.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///18925537894.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82177abd4---bumuxokakupuzokil.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/92603885686.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/gamuduw.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e283509598f2f7619c7e4bd75bee3ad1/xubujubapopagawijomal.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/xapigubuwagalawivur.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/20048543066.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/goxumegenetupavezidita.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/d536mrgfbd3ibp37ie6aruap3i/11309874094.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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 10820 bytes
SHA-256: b0cc389da3da8881124153fe0bf1a781ff94aa4dd8e818f985c58306df3cba84
font_01_sfnt_off00010677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 17252 bytes
SHA-256: efabed8c9e338cfba78216a01362e9d58f2c50440f6a84ac2e2a137c628711ec

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