Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb664dda75744ca…

MALICIOUS

PDF

47.7 KB Created: 2021-06-07 09:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fdd6b2d6fb835940a3f2600e4c5c4b8d SHA-1: 5f9bf3d15e2621240e9767cafa786407a68acd51 SHA-256: 4cb664dda75744ca62b00853f6a52ed5efc3583b6e6579385230a0cf57bb8e16
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised WordPress sites and disposable hosting, likely serving as a link farm to redirect users to malicious content. The document body, though heavily garbled, suggests a lure related to a dental operation PDF, which is likely a pretext to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7248

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://allytemp.ru/uplcv?utm_term=operatoria+dental+barrancos+5ta+edici%25C3%25B3n+pdf+gratis PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608659aef1f88---modezepifixubu.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/klg6m7a0bj6b1940chv0idhq07/11998111300.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c5e45ce82fddbe1fbcf7f693e01bbf4d/70557381137.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/dakixosumibaz.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/rinuwuxetefe.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776c4f7d517---57615898254.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/geluwadukonifen.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072987fc3428---36980101933.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jpfnfsig4p0l3oapmv3pfut4p7/buzoredekumixunibanuv.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a9d11e9f---vibiwit.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4884ce3fd75d07fba353ff5b1ddc4884/6060215787.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4e2c371b---5840939734.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8783eefe1b6795a53910f84037c4d35b/jajitewom.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b1b9e673d---98076108728.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/43139841285.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862c7534397---51139432101.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/itd02mkv09qbi9e3lrr06qcth2/xalad.pdfIn PDF document text

Related samples 8

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

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