Malicious PDF — malware analysis report

Static analysis result for SHA-256 db85bf5f63c24387…

MALICIOUS

PDF

62.9 KB Created: 2021-06-03 05:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93b3b91bff121df11d61a288af1f6573 SHA-1: e8f6d81006fca31c80a540feaf5ea3b397ea6f50 SHA-256: db85bf5f63c24387c03f1f7d87e696ba0cc24487545727f146c42ccfb4191d1e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable domains, suggesting an attempt to lure users to malicious sites. The primary attack pattern involves directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8474

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 http://amandamaitland.com/images/file/ruvemajitururanal.pdf
    • https://topinsolventa.ro/userfiles/file/popepupepil.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f8432d73922ad513f4dd7e2d2fe0a106/58398027252.pdf
    • https://asset-books.com/userfiles/file/92928016587.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e29416de7---77719103714.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16096b56d848f4---nuzanudiwulunozab.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943fd52efb4---nesavapug.pdf
    • http://brette-animation.com/userfiles/file/39207198948.pdf
    • http://iphysiology.ru/upload/vapavizoboxosivuwi.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/36869349914.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/dlsjf0f13s5u0u3g56fltkc9j3/16678052479.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/japavuvetipijafumilad.pdf
    • https://angkortaxiservice.com/userfiles/file/zobijaratozolo.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb6c745758---nugidexudetabipejuluvodo.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9ab43b70271abeb63741bd86fcf7b588/puxixaw.pdf
    • http://animalscipublisher.com/files/upfiles/file/7882789169.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ascii+code+converter+binary+to+text
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ce.bin
c4bd77550db1c3c0cfffc4e896139d827e38e37160dc9548b8a1fb78def31906		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 5048 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.