Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e965654dbee843…

MALICIOUS

PDF

62.3 KB Created: 2021-09-29 13:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e3f80555f131aed8a4d8479ed482fd5 SHA-1: 0a9adec844c7a6c063548537da6a63287c3d641a SHA-256: 18e965654dbee84318028c8b54d801efc12eb8732ec6daeb0ba0da38523df302
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using such sites for malicious distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d50ccf1416---xekujurav.pdf
    • https://deltaguvenlik.net/userfiles/file/pazidumijorupubojufesakad.pdf
    • http://etpatatietpatata.com/userfiles/files/75308559924.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/jelapomutodevojuz.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/tifenobojijexajamo.pdf
    • http://pagyesa.org/userfiles/file/20210924110146.pdf
    • http://hstechno.com/userData/ebizro_board/file/90168366529.pdf
    • https://cvzona.lt/resources/img/files/9977465568.pdf
    • http://vuatoyen.com/uploads/userfiles/file/pilisumowik.pdf
    • https://adepotcustom.com/UploadFiles/file/20210911115445150.pdf
    • http://sinners-party.de/media/file/jexik.pdf
    • http://zaintik.org/files/galeria/files/7696831948.pdf
    • http://yoron.net/up/files/66865276050.pdf
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912120157568142.pdf
    • http://qdxqw.com/uploadfile/file/gosakopetatixawesil.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c843fc018b---xeruzupaf.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kefasep.pdf
    • http://npi-management.org/ressource/site-image/files/duwilexawajomo.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/61712639757.pdf
    • https://avukatwebsitesi.trakyasoft.com/upload/files/58489472774.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1b8a5a2db96ed2d757f03c63b43f32a5/12012953895.pdf
    • http://szwygs.com/upload/tepegosinakopalam.pdf
    • http://www.prieteniitehnicii.ro/documente/file/3399413567.pdf
    • http://zhjpharm.com/upload/files/37918466641.pdf
    • http://daiwavn.com/uploads/image/files/76820568983.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=digital+marketing+strategy+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000b98f.bin
5771cf7787a649ee031e3432a956c882caf8d9d27b5c2d313f8e2a0620de7611		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB98F 18556 bytes

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