Malicious PDF — malware analysis report

Static analysis result for SHA-256 6257ef255debb9c6…

MALICIOUS

PDF

93.7 KB Created: 2021-06-17 19:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0eb3847142f62459621d72e999e3ee5e SHA-1: 25e5e78756479de8a53a8b224267aef79b90add1 SHA-256: 6257ef255debb9c67088cafa570edcac96bf67b112dae52b9d549b2a7c3bee64
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the structure and URL patterns are indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5894

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=smarter+faster+better+book+review PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160835a34d04cb---telovizabotapigaruveno.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c784c9bed1b---guxawunopupadapeliberemu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2dd6ff55---joxuwiwufarurutarux.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/96204826530.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/04b4b93986c7df98525c373eb15f88eb/53427342913.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/pewizupabowepojulorone.pdfIn PDF document text
    • https://ka-base.no/images_content/file/nudototuwibozomemo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a9cb1baf0---kakeba.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8554a30919c336a3d0238e186c055149/49496217552.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/499e9226eaeb3f5ff8f225a44b31344d/juzomabezupunokajagog.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252798542---nuxepasinovofas.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ncpodjeuq7ug10np05mdoo5mc2/39443229116.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/11088669461.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/d15efc9304282066969c41cff0e639a3/xubojijur.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/nudufumafukuz.pdfIn PDF document text
    • http://soupworld.de/upload/file/titexemobavatakosuxufo.pdfIn PDF document text
    • http://insidethedigitaltrend.com/userfiles/file/xofikuwigepixugez.pdfIn PDF document text

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