Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ef37d5d9c2ff6a…

MALICIOUS

PDF

89.9 KB Created: 2021-06-25 20:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f568742d4211fc9eaf0ecf84e42d9b8 SHA-1: b7f442de6a4eecdc3090a744a893bb682bf0a175 SHA-256: 76ef37d5d9c2ff6ab8c8aeebdf6310309e00f4b0002770160d86c3fd56eab460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, some of which are hosted on WordPress installations. The primary goal appears to be directing users to malicious content or further infection vectors through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://bmsorganica.com/userfiles/file/6297030353.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160883cac6fb8e---23720356704.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609b15136b77d---89559939768.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/bememawigowabigapazo.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/nizopemilavufodegej.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c557863141b---83503416900.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/niforuze.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/3vl5r7k70ui57p5mc0ju958s7i/96481796498.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc90fa77a6---doxudutuja.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39a8111e6---8594316844.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609672122ba6f---82933916529.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3ae6d408---fopavefosire.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6clon2i93v647s5196efh1gn30/39610395834.pdfIn PDF document text
    • http://riversedgefm.com/files/file/92201326944.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c178edf0a35---21297737967.pdfIn PDF document text
    • http://waypl.pl/upload/File/bubuwegavimeronibowo.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/8770959689.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/vufimedakival.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b11d5642d7---76561571815.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/lmsptv74nuti96hr2cegqj86cu/xorugujosimugoxeganisun.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/lubexepixatuxevifeni.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160712782d12b4---8273029458.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b624e230---98200824741.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/56094514718.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/13680616193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bite+more+than+you+can+chewPDF 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_off0000febe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBE 16780 bytes
SHA-256: 3e55339518b9cba30120250456b99b97cb13219752d6dc7cc7160983bf9802c3
font_01_sfnt_off00012a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14233 10636 bytes
SHA-256: 9477e3ae26c83b6c1477b9e72a2ff4cebb7fe0d7055b40150ccaa1a74ff2b85a