Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2308c937b712398…

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 01:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9c67ed420b4637fb63a08383d1b6156f SHA-1: 2f52a6f5d36c9c4fedf2b06adf7b57855b374b96 SHA-256: c2308c937b7123987a7031f18c2e89f99dc1df0f7a6771b6c14b004f657a4ae5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised WordPress sites and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://minutemen-jrotc.com/clients/84940/File/fetafisazomo.pdf In PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/1fef89c68587d67e65bee876483855f1/bijoji.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4b55bed8e2030115e4dda32304cefbb3/58709578581.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021061109055870554.pdfIn PDF document text
    • http://potlista.com/file/files/renodudubin.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/64789096356.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5feb2eab407d71a322df07202c40568d/vugumo.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/0f2aa6aa45bbfb71abda445e9eda21a1/kowumi.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/baxumujiwejiwokazebifa.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/jozukopal.pdfIn PDF document text
    • http://unsersohn.ch/images/file/tipikoleselufewekoxab.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/95218083043.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/13770075056.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075f16f21d7b---79458966908.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/24874564730.pdfIn PDF document text
    • http://ruresept.ru/files/file/sopasokufodosetunigotudeg.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/i5v3p759mlh3d2khvpp5gbivm5/90084010305.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/84014344704.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/xukulixujameji.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4d4ac2d1---tidopetejozi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2ab6711139248c57a308cf7159f8a160/wisiwafuzuzasekusupevef.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/71329113059.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/dudafofilamuzipawidamevam.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/237ebf3e26028af39d1a6cdb77363e92/mijadafavizekabu.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/17406990063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=philips+respironics+system+one+user+manual+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_off0000ccf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF7 11100 bytes
SHA-256: 72045640cd3faf0c1738cf4bed6f7876a29164a82b8f26bff137de10e62d0b61
font_01_sfnt_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 17060 bytes
SHA-256: 736b0a31b1fbcfa20b86c1f69512eb31cf300eead29ca98279418678f65b5f6d
font_02_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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