Malicious PDF — malware analysis report

Static analysis result for SHA-256 125993d18e7bc400…

MALICIOUS

PDF

78.6 KB Created: 2021-09-02 21:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d915b77cea9b57a658549563712089ec SHA-1: 7f4564a697044456a3338ff6e3a7c8c3ffce7d08 SHA-256: 125993d18e7bc400a76508523b1944d1a583d1fa43e6878fa87c51d5a5a17c32
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. It functions as a link farm, containing numerous URLs that likely lead to phishing sites or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pistant.ru/uplcv?utm_term=2011+chevy+cruze+repair+manual+pdf PDF link annotation
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d759e7b565---27067524638.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/a7fb74c1a3e092d0e0a42eb5d099cfb2/4834234663.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/zolilakivodugurogane.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/16673205983.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/widukowoxuji.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c693dc66e9c---wusij.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100b1094e2---ragimid.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3ef7d0b6da1775251392010cad5c8662/95269526756.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/gupifunamusajeluviz.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/livuwamer.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/52916998335.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160892d111e30e---96862113348.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085afb670518---84183316099.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/tjukvsus450kmjpc5sjhcpgiu2/74656663026.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/16679225188.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/31cf85f5768663f0dcd66269bff632c0/nusetixinisivupu.pdfIn PDF document text
    • http://superbarter.sk/media/file/93760643741.pdfIn PDF document text
    • https://efnnma.org/files/file/todirarigufulezufibi.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/zuxubixifujoneb.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/392g33v5j5qjruf01r6jq4g1g1/dotokokowifemil.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-18/20210518185420136497.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/17474857216.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/55bdd5941f8aef76ceed319d87eb332d/pubazusukusozurelefipok.pdfIn PDF document text
    • http://renovator.cz/files/file/puvovugemip.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160adbca05009e---64076418658.pdfIn PDF document text
    • http://17njl.com/userfiles/files/gaponamefufesato.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_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 16328 bytes
SHA-256: 50103ad6b78808ca45da7a3322bfc8ea29fc67be4e9fdd12f75ab994d98e9e74
font_01_sfnt_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 11036 bytes
SHA-256: 8abc605510086aaa98b197c16bb46ea9f63d0ad3e1a8f0db3e6a17dbad0ef93a
font_02_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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