Malicious PDF — malware analysis report

Static analysis result for SHA-256 8177953cc626f3b1…

MALICIOUS

PDF

77.9 KB Created: 2021-07-30 06:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 002fa504ce9eedb48e5ad3485db536d1 SHA-1: 3f6c9923d7796f7da81ccc609aca43140079e495 SHA-256: 8177953cc626f3b1a1bf7bd9184834ef531f49909baa7ad4cdf9ac69dfb985ba
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. Heuristics suggest this is a phishing or malware distribution attempt, with ClamAV specifically identifying it as a Pdf.Phishing.Trojan. The ML classifier also flagged the PDF as malicious. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7689

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://giritrademark.com/content_files/files/32821539629.pdf In PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/88798857064.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/43941468448.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/22kjltnd8ebv6cn2edikcqgp45/fasidesubusikojum.pdfIn PDF document text
    • http://mesterek.net/tmp/rowodizevatedo.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a22124eb93f---15842166110.pdfIn PDF document text
    • https://aokman-drive.com/d/files/rasimo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d6fa0f26e---20232423985.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/32964969722.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d21546dd88---65526249889.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/furoxazoloraxaru.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/aj7qgff2sqbjiisefechq2qg57/79019724002.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/parilafidakekusufo.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/81858340252.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/voxujideliduxusub.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/48399945606.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/lugizabipi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/569be2f356f2780ff9bb5547d7db13e9/50950012597.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d65026c29---80243836459.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/51654761377.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/c61b11a4287fb395214eda999c78ef0e/27838191538.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4fcime4ta4hn80b9qh20ekooa7/nizawozugamonujuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bible+activity+sheets+printablePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 10724 bytes
SHA-256: fc277dea91e02ed3cc0c9c638ddf7ee8925d8b864c2fee41a9d3cd0389f7db85
font_01_sfnt_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1