Malicious PDF — malware analysis report

Static analysis result for SHA-256 653eee38c5e2269d…

MALICIOUS

PDF

55.8 KB Created: 2021-06-18 02:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5373cfbaf6f45fea87c0a648b5a03af SHA-1: 69f9bb7c2fb6caa098d6cf14569e622d5ba3466f SHA-256: 653eee38c5e2269dd35f54598f8995b8a562e65770688a16651c2a8dbd62dbd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the 'link farm' heuristic indicate a primary function of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

Heuristics 5

  • 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
  • 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://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/75abb7686f8095a157bc5a99878375b9/87850544471.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/a5fcfc106549229059d9265cacce56a3/fiduxaxof.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ebf09577---fikamijipix.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/8b81fd55911f87cd6bbe699dc35e4973/bitalibiwozuxagulujaju.pdf
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/bojojibeg.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0jqrc57bldvb45lrngsrttalre/dalatutudaramuwunogelof.pdf
    • https://aradovan.com/userfiles/file/pexogov.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kiwumebunipasaf.pdf
    • http://alhouti.com/userfiles/file/zozevubisuxaluwanotuja.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/43786461789.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd95ae4c341---15656549611.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5763e0fb39---59002636002.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c0cf15d2fa85d1e510eed63f9583d960/51479814361.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kiralik+ask+episode+1+english+subtitles
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae4f.bin
cf994f0b7b224b3cdfaf87e7653ecced9602bdd7592503999cff80b8d6d26b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE4F 5444 bytes
font_01_sfnt_off0000c0c8.bin
89d8375ecec224dd9da96e4d072054910cba3efe4d80dff3260cc5ef4044b514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C8 10672 bytes

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