Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da18028e921170a…

MALICIOUS

PDF

62.0 KB Created: 2021-07-04 08:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fb997d5638daf4b9e4d947b96288439d SHA-1: 2aa519d75f1c1a191c3b99f8e96bd8a7def24c2c SHA-256: 7da18028e921170aab38608a7af77e54e938707223089499a659612f2c9f760a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. The document contains a large number of external URIs and link farm patterns, suggesting its primary purpose is to redirect users to compromised websites or potentially malicious content. The use of 'utm_term' in some URLs further supports the idea of tracking user interactions for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7022

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://krisoc.ru/uplcv?utm_term=pseudohypertrophic+muscular+dystrophy PDF link annotation
    • http://angarakshaksecurity.com/userfiles/file/demimexamizesebifu.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/favatonurulupenenuvoril.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3662171fe---20204396922.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/fikoxuribopeduza.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2560aa76a---4120065062.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/2d384e17dd4af3fe4ae22a72aa14258a/binefapibure.pdfIn PDF document text
    • https://unitjaya.com/contents//files/39186220284.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/2775057837.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/53c25895e486962670d893118913d8fc/pimuda.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1247eca35---woxifupitekofasazaral.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160747da726bc0---83286368883.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083e01516328---11742336290.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/39924021837.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/170702324218.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3d714f7b3a4b61274191e6d1e366ccaf/54618670271.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8deb123ce3---vujetojatipedizo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/415d85e515dece526456ec580598226b/pavigivusamirak.pdfIn PDF document text
    • https://puppometalli.eu/file/13195805871.pdfIn PDF document text

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