Malicious PDF — malware analysis report

Static analysis result for SHA-256 908d91c2622c5392…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 05:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e39216933333e2d20f4c3c49e17728e5 SHA-1: 8ebda6859f00614de94a7476ec0894495c951234 SHA-256: 908d91c2622c5392b7353fcdcdbd413739bd33096aa7c7b7035ea66b9a227863
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=ground+source+heat+pump+installation+manual PDF link annotation
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a98244f24d2---wugiwakexojoridefe.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/11898064834.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607472fc98be8---xalozapepa.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/23605391754.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fbf18a3f0---nuledazedewoxelu.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f236b7d33f---mijudadof.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4fcb64b49487326df47e8e67c62817a4/23543331436.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160765486ce23f---17640816815.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/653d3a8c5f32ea5f23c7c37d6d4be7a6/paramovegazulalusapug.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/70897453217.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947a49ac619---kujogiboniros.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/044abccd02023746d593f074ccdf9275/1936612339.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/36126380280.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/29770378686.pdfIn PDF document text
    • https://emmaushuis.org/pages/lokigofopavo.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/danezusobivalowavebajujez.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/zekakimalutipejatagol.pdfIn PDF document text
    • http://yuha.be/_files/file/nomununetodebutudo.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/dilagojevesafowuvo.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/kugogidu.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/warixafasumajezafezukuwaf.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/batixeninejubevetofuki.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b52a069d4ecb3a1a19c70ff6f7fbd18e/segilebidiwegivaluwupu.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/30749437412.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_off0000c46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46B 17296 bytes
SHA-256: b5827ac739d37ba7d76109029620460a0abed4f8dd0b911fbcdd4e0004a153e4
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 10920 bytes
SHA-256: 8c6d996fc35757f34809797a58051a7ee5e4a446e41715b000cf489c99d81b3f
font_02_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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