Malicious PDF — malware analysis report

Static analysis result for SHA-256 26baa6470e1e3a12…

MALICIOUS

PDF

48.0 KB Created: 2021-09-05 17:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4f0b98a904ef8ebff32810be6bce671f SHA-1: fbd27ac5055109389b80b3de62bc51d4e1af64e2 SHA-256: 26baa6470e1e3a129dd0a87b0de3b8dd0bc8bd0a14719219b6761647a6ebfc97
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external URIs, many hosted on compromised WordPress sites. The heuristics indicate a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, with the embedded JavaScript likely facilitating the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9210

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=pdf+scan+software+windows+7+free PDF link annotation
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/rj31q0samcd45qtniqib442t9l/34561110758.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9ca3905416---jovigu.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/38094452600.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/guzuzupabukefobigitubek.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610006ef48bc4---2125878260.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/96654471229.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/lilof.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9b225c94---8732590478.pdfIn PDF document text
    • http://dzbnf.com/upload/file///nunuziketed.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a52c918fc06---41796269802.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/7350898157.pdfIn PDF document text
    • http://alltechsro.cz/files/17251053286.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/c2a30a9a576a1edfc1e15dd00bd69995/34038707576.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/vodogepotedadudidexe.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/e6e79f7f693c37f71c225ccf2e629f1d/46088888389.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/jenasobaruvojowuzutokanor.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/51165988032.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/74957668476.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e718a8eefc---gesevekofedujumosuxexob.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cc7b6034f---52808909578.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/25435370557.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c876d810d47---wenonukavetaduf.pdfIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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