Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a26b59793c7a84…

MALICIOUS

PDF

67.5 KB Created: 2021-06-18 17:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f294ca25df7339474032c6bd777730cc SHA-1: 9ce9ead6abb84cd59814dbc4f73bc20e29651701 SHA-256: 12a26b59793c7a8429cc43f039f118c6b268a1b1cbec4ee2ead021399fc215a9
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, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8596

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bfff3a1a5---jewokitexeruriratuzebave.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ohobeks55385sr0fjfpa931rf5/wosakofapa.pdf
    • https://kovtec.pl/eurostyl/photos/file/77578221487.pdf
    • https://madopin.com/calisma2/files/uploads/67091497920.pdf
    • https://cornerstonelaw.eu/userfiles//file/51561944694.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078203d951eb---ketaxew.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/79713981993.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vg6cs9tkv95i6a095j6ik9pq7e/88124316257.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/adbd57129bf1e8e0ff8e8791e97c2b5e/74452775675.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3077708f4---44376149271.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c81193240---80826034276.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072b04a9dd5d---7150644828.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/hhqt7pslf5mojvhp01e4iqd3h6/30434023580.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb8b178e16---kakusosawekofuwopuxedo.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f53aab9a---vugokafafonerefupun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nth+term+of+binomial+expansion+formula
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65a.bin
e3b13c79b59e97ba422439e2afb7ca6e85999c4abf69b7d9de6736849170edaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 5320 bytes
font_01_sfnt_off0000e848.bin
ca2aba79124b26f7b8dcb83af4ddcc2ceda6ec9d43aa5418a627a5035ec716f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE848 11244 bytes

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