Malicious PDF — malware analysis report

Static analysis result for SHA-256 c348c3d1c23c17e9…

MALICIOUS

PDF

79.0 KB Created: 2021-09-15 15:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3c06d2dba63dd3ecde7a4195b5a8ddd1 SHA-1: 045d87d812da0cf6fbd9d0d0a07bb35ef6173936 SHA-256: c348c3d1c23c17e9c07606bcd75962f271bd3a57885955f1f37cced3d25ad0e2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The file's authoring application, wkhtmltopdf, is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6584

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://smidgel.ru/uplcv?utm_term=boku+no+hero+academia+the+movie+heroes+rising PDF link annotation
    • http://fueandhair.com/userfiles/files/xijuzitisagur.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/56149560984.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/78388308164.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/41940525528.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/wagitogoxagate.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/26924785019.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/rakesebijubolujiguzu.pdfIn PDF document text
    • https://penzion-palice.cz/content/varuzugo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614119d509c5a---13162321929.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/lugumosaz.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364de83f8ed---1138892540.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/dofolidiborurubuzomerum.pdfIn PDF document text
    • http://apismorava.eu/docs/81321559045.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/15027349900.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8c7682ad3c80a5726d7fb1238e5021dc/nesovaf.pdfIn PDF document text
    • https://sitarasign.ir/data/file/zavesimizokijakede.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bazizabi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b14e42de81447dff2e4130c7dff0b68c/27351821710.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/9761863661.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/funikoxinapopeze.pdfIn PDF document text
    • http://allasclub.com/campannas/file/fujuserasukidisexaxixul.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/84688044863.pdfIn PDF document text

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