Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c436a72ea46a59…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 00:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 6e3d048093411a9b862198a1b8b95bc2 SHA-1: 9b6ef08784884559d2b2436538bc31da61fb8a53 SHA-256: f7c436a72ea46a5985e14ae18fa34e55429bd2a2cf46c9d591e71d272f4690b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm hosted on multiple compromised WordPress sites, designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/63d3c41223186129b9fc4192eb68f3f4/66079070449.pdf In PDF document text
    • https://congchungnguyenlieu.com/uploads/files/1747458416.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a560726f552---50859985149.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70cb9f0ea---fuzebikakew.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d484459a05e---lotefazasixevivepifez.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/g3dlocl771esbdb2k9q5f2mfk0/xexupepir.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/zakofiwofije.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/97780464073.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/gufijojiri.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/61497813904.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/lodavatejuxirovofup.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/884f1e0c54d969b2c42b1d91c2358b13/mixufiragubomopi.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cded0021016---babirokigem.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160799ab1b7d85---duzamutanimajuxikoretorem.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/a083d22d34394a320fc8556b89b85852/megivekafaba.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/fe9c0795ff2d2bc6448f2261d4ee3b6c/84544986633.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/2de2fc5dd4ae4809fca855f1b846982d/zarijif.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1vpibudh6r9pcldtvsad4hvaf1/66434969185.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176ac2d4e1---75685662161.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/83633468695.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6856b895---lisexubisop.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/96697487806.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/madabawowunorasufokazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mulled+cider+with+spiced+rumPDF 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_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 10572 bytes
SHA-256: b1e00efc080287623544ee3dd676c580fbbfd1e7f78a5cf4eb6c6bace86b56e1
font_01_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 18148 bytes
SHA-256: cce13ac1e04b10959cc99d23b6b179aaca7054329f70b6aa7832f15cc3f0bc94
font_02_sfnt_off00013533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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