Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a9a061b0f6a51c…

MALICIOUS

PDF

78.3 KB Created: 2021-06-13 15:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 78ac61507a96ff81ffd62e9137508e31 SHA-1: 858123b0b1b232bbce6edfd278ab758192a1b230 SHA-256: d5a9a061b0f6a51ce27833dc0d07b8561bf5ca70e7791aefefd9b3e301ced3bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://huntic.ru/uplcv?utm_term=reading+practice+6th+grade PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608396296b621---19356380703.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/luvirul.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/62fbnfo1uh9j1h50mj5f7gqvg5/42580495614.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a35fd0576d8f7bf3f8ea89fc52bb9918/sofodanuv.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/085cea491f48a80f036a30f15bcce994/bulubepid.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afcff63a06c---poxafilojikuropala.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2085626375f5026b4f278a3d6f274c80/lomujujowimasuvuv.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/e302a5b05f47299ea594062fcc4caf6e/4846354719.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609491af00036---dilunakapipe.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fe07b24ce---25388998714.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e3f4b86ef363049a589dd622a0439c57/62647139733.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/ddc06dc111fe7f4e188f7bd7ab75b593/4397313803.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/77181239680.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e5b0b3a94afab115dce5728b1c63b5f5/jimigupapeju.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210609194525.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/tukoravip.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/42412148896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 5288 bytes
SHA-256: 9a1635d2b0bbd8521d53a933dd0d376508b62e9f153792d2da5c97b2bc8e8721
font_01_sfnt_off00010874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 10564 bytes
SHA-256: 63b9d57b279a0cabbd4bc136478d0ce7c3e39ee58b99097996ea58be397ef15e