Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd088190095e3926…

MALICIOUS

PDF

100.8 KB Created: 2021-06-27 21:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1f720d72ed93e253213402f1dd5db40a SHA-1: 1b75005307f6f0bf0f17c6d7ab93ea2fa33c3e09 SHA-256: cd088190095e392676b08623365c9f174c52ded79b9e0bab9d48685925975794
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3f4738a39fa0248e4b543ac73cd7befc/feketugivejas.pdf In PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/92411447657.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e8964329550b63b06a7cceddd43b9eca/fumalizepo.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/89ff6400758b20159c1b1f9dfab03564/bukizinifuj.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/59371557865.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e131eeedb941992b3ad9cb5a394009c8/76807192162.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e128a005---87003316295.pdfIn PDF document text
    • http://446888.top/userfiles/file/silajaxexiluzixemelanavid.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16090e7f93498b---vobudenerinepoz.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d9ae960d8---11938603363.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/4c2b808014e47aebfde8e275a6595976/1680691083.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/kulin.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/zefunatoxoxolawejamuv.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb43f4e570---pixukedodegifisofa.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c84f6e120---misekitajopitoxobubula.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7550ee98e4---14197162852.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856f0e90063---37986451178.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wusemimidagewuxumiza.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b73ad63708---20070348524.pdfIn PDF document text
    • https://prastosten.se/anvandarbilder/95/files/62743158441.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/89187201595e437560507545be213d0a/94294327895.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1919a7e986---35626399459.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/fozowav.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607481c430e95---65531083160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=transformative+learning+processPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 16308 bytes
SHA-256: 056c635445ae957760832ad9ce81bbca3f4175d3b80c9769c6e0874bf6aba3e0
font_01_sfnt_off00012133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001394a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394A 10852 bytes
SHA-256: ea4c2acf7677aff749340639d8c8bbff7e51b67054a45ac2e9c8645f1a84a825
font_03_sfnt_off0001525f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525F 18524 bytes
SHA-256: fa2b33402cb816805062db6b6ce72de39e1666960fb525c4c341ef733590f880