Malicious PDF — malware analysis report

Static analysis result for SHA-256 31398e9684e89e9a…

MALICIOUS

PDF

66.7 KB Created: 2021-06-01 20:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5da5ef10c6db2676a465486d078e9835 SHA-1: fbfb0e1622486361ea4cbc092b63e7669b45a340 SHA-256: 31398e9684e89e9a133dda03d3662aca0da5426238acceca2406d76429793afb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

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://wastran.ru/uplcv?utm_term=adjectives+exercises+for+grade+4+pdf
    • http://consulcongress.it/uploads/assets/file/41035926369.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803436a9d21---28357244816.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0bfca29119a84ab82ff233e6d1c67257/kikojasu.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a0855fe0---21714310883.pdf
    • http://micronforgacsolo.hu/UserFiles/file/55882134646.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/650b65a4af5bef915b5a019f926f12a1/womovufazigurutewerurebu.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/eakrgq4bf3fk6seu9cvrqm2q95/vitirasevevi.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/48d919f380fff3ae7ea025be5b9b5690/71171638779.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084ccac07f68---92992584512.pdf
    • http://alexlunacoach.com/img/editor/file/wonikerabajevedoweze.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c1865a933---pogurevukipafavivodajedux.pdf
    • https://cissud.com/uploads/ck_editor/files/nuguvuzib.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609074822f7b4---rinojamuleninugaxolev.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1fc1ee2af8ecc2db79e46dab5c11d87f/50818422631.pdf
    • http://www.aportecnica.com/imagenes/editor/file/kawirexa.pdf
    • http://arcomproltd.com/userfiles/file/rojovixupoza.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca8d092cfe---24184890992.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfca.bin
5e41242010c5a4b0be83876b4b2cdad4202f477ce9d4b5b3e2d5602f204ee842		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 5572 bytes

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