Malicious PDF — malware analysis report

Static analysis result for SHA-256 039b9f4c575ef1dd…

MALICIOUS

PDF

60.6 KB Created: 2021-09-06 04:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9d0cf4926f01cf98c57cae93410e869c SHA-1: 684a273b66ac70bfe80637aa99c0492765e460a6 SHA-256: 039b9f4c575ef1ddecc5bc79a20e653829c998975d86ab866106c296c93ba830
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9014

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 http://homenet-spb.ru/userfiles/file/pobukokukovitirogano.pdf In PDF document text
    • https://egf.tw/test2/images/file/305978787.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c173f8cc71a972aa70dc3d908ca67e97/82716247637.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094121081e42---xajifoj.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/oermau5b021vq8030ou384jsc7/liweditagobefikeron.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/6425712988.pdfIn PDF document text
    • http://kunbot.com/upload/files/6505797496.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/bunafip.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70587812622.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55def2fba8---durizirevimebexolu.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/timubonadapala.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a36c90cd63c---41631714921.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609df96885c30---tulilesipojebugezipage.pdfIn PDF document text
    • https://webmenuplus.com/images/file/68469271217.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e947bc2fdb8---15305471999.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfa224ee9---gejuwisigalejikutijokijas.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210806120646_b5wl5o.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f05678f3---45352687268.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/xogalelopirixaretu.pdfIn PDF document text
    • http://christopherdallo.com/file/mapevawamotejiwegobunus.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/lemav.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/lulanitaxumen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=direito+empresarial+estrategia+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC885 17088 bytes
SHA-256: 62540c33b67cefc6bd6f17346fc2d4a11881d055054d60bffe27b0227ca81262

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