Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d9cc3a71bb0032…

MALICIOUS

PDF

61.2 KB Created: 2021-09-01 13:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: df0a55ad56acf3827d0fef608e036821 SHA-1: a3a14cd726008a495030493dbe233306b55a39c6 SHA-256: 60d9cc3a71bb0032899258c4ddddadfde47fee78ac1433c6401730a87daacacf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The presence of embedded URLs and the PDF_URI heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7689

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://chcial.ru/uplcv?utm_term=clean+install+windows+10+from+usb PDF link annotation
    • https://tomorrowhubs.com/upload/users/files/gatalaru.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107171756242510.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/gokarerikuririmonemaku.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/tuwub.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070ffa9e0474---dopusigivebivo.pdfIn PDF document text
    • https://service-panev.com/userfiles/jaragebuxopizupok.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/16807020839.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/51488139973.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/sokab.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/3570165707.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462c556c5f---84753042614.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/cd6jpji86pn8chg67cnfllf7h4/tibupigimageromodevom.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/zopafuwufusefoji.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210805060346.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/8877991841.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/vifidekaje.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/luraxipazepigodoxemuzome.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/791580529.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/17913207407.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/gunojelokoturokezunoje.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-8-28/20210828110857597342.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/vixefukusobitedajo.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ca83ea1e58bd2e55bbd3509e07e47348/92113045214.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/2239853335.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/48451368348.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/86966693318.pdfIn PDF document text

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