Malicious PDF — malware analysis report

Static analysis result for SHA-256 e462b9e34601d60e…

MALICIOUS

PDF

67.9 KB Created: 2021-06-10 08:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 018ab8a0fdaf1f81ca0ccb5107ea7b69 SHA-1: e5ad56135dca3d5a91e7339340a9c0d91008bc84 SHA-256: e462b9e34601d60e7cd312e39ae52304b723be744b80f44061b85b46b3ec1e7e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are clearly discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8149

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 https://infrive.ru/uplcv?utm_term=mini+audio+amplifier+project+pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16091b9743c4fa---gatozewu.pdf
    • http://adabaskimerkezi.com/upload/file/xadafumivizerovam.pdf
    • http://allaboutdowney.com/userimages/fujinulutotuxosusize.pdf
    • https://ewt.cz/res/file/179355694.pdf
    • http://ventilatoryzlin.cz/images/file/badodizufe.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c14826c59---verugolatugebukopanux.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb74d84dd4---gewijifekuz.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7583c124f---soboxudutotagugo.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/75958367241.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/0daf6395fab7e396a957a409d1da53cb/jowutilibux.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a749419b---zofaz.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/g4pitd48ngeidurv15lrg9gs45/51431732582.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/36c63660ecbe4483883d1d9c7f5c1aaa/faduvisaminitum.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_off0000e56e.bin
8c4415d14f270084e996f8570f3bac4c86e54304008514ec483eefa72f2dd31b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 5204 bytes

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