Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd4670540873a9c…

MALICIOUS

PDF

52.0 KB Created: 2021-06-06 01:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1638ec2979726c52d4dd89c715820b3a SHA-1: abb9a127c5196d7978fe83d33736a893ad22e19a SHA-256: 5bd4670540873a9cc4d00af620b7e57d7b1d25233d4379e141842dccb5e57dd8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7360

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://ketchas.ru/uplcv?utm_term=oraciones+copulativas+y+predicativas+pdf PDF link annotation
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rurb5q7i7dfuisnka67qkmhp7c/wexivojesesewerebuvuk.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/pikojiz.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38894e7fe7---74665851067.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3172c925d---wewaguvumozerex.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3445bae7f27ba1c55c26e3bbe3f5d855/11257167222.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70faca3eb---33541703127.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f8babf070f9ab6133ce12566fc2c33ba/7233050815.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace2ba71a2---83536448586.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/49604976616.pdfIn PDF document text
    • https://gannat-ltd.com/userfiles/file/46100898540.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/rsvltgtlfobf2clfakct49sp66/nurevupuligajalefozoj.pdfIn PDF document text
    • http://flexa.cz/docs/file/57146541903.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/wukabun.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/memiru.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/melokakamajevozuvazabow.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/mekelup.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ca144a09af802ccb90791d52bde4634b/12808318275.pdfIn PDF document text

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