Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9b343f0241335b…

MALICIOUS

PDF

62.6 KB Created: 2021-05-13 00:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71bf83b33e3b2ce979800aa66c60436c SHA-1: b04d0af59ac02468fe023331eeec32830c17d304 SHA-256: 6c9b343f0241335b341143ee9b042f47ff7c3decf668757b7b975c96e377d523
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://mariopresto.pl/userfiles/file/xelajivivebafi.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/24201710420.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078671be7dd0---zizuperagatigameputi.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/8522d45cebe2c6b45dbdc5257e5843c4/85713411353.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c44e6744cf---31646187682.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf9cd1e09e---wuxaxepijanofimog.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c827233081---derakutabuluxo.pdf
    • http://www.bufolari.com/public/immagini/file/dinizosesegoz.pdf
    • http://www.anclupnapoli.it/userfiles/file/7221456943.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/14bbf4000fe4cc62db9bd6550fa93a42/62067156129.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/edebab8f38d81759982e244701a4986c/fuwumalisetunolumi.pdf
    • http://stalmost.pl/userfiles/file/9286426291.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0cf24fca216420f8fc21b16e11c14ade/48282073949.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5cpb0q8ii67vqe5m1plkd4or62/81714843091.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/acf2f0319af5ffb5192a045f3349735c/26573504812.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1qh0qb3i7rciq19c1454u6uekf/lapivakiremo.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb80cb59ed---punogavenupokawolujen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=columbus+police+accident+report+lookup
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22d.bin
f16f62cbf73a4f229ed2b591f64ad5966cec90c7f7f044eb8bda2c70bdf5c244		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 5328 bytes

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