Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae0a9d96922998e…

MALICIOUS

PDF

64.8 KB Created: 2021-05-03 02:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65e575878d023c2d33f3eb82d5f68498 SHA-1: 1e739d04334c4e4ba14070e4688bf077ac045d61 SHA-256: 8ae0a9d96922998e358d103d0603ef309804cf612f7e7ee57e727df25940830c
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 external websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6337300fc---48474516149.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8c2e689c---6686854944.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/q867n61tjsa2j68c59859dkf54/fajigiwamotejo.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/71fa9e8f3e1cc65f6d000219aaf63d5e/99162366043.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/71779e82dcbffc1a59c0df62b64cbcd0/32514412797.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/659ff32edb639fd6dc23b3f82780d3ed/mexebisofelavegidox.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6ece2c6c---36753078753.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825cc87ce01---zivawojakelu.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b57b1981a---ribifusoguzofiz.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858653a32b2---59290964625.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/27jjrp5d75pfpbnnlr9svu18a9/7032522043.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d3840a6ee466fb58bc3933f4bdea39aa/71290155028.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d0066da9---fivegiruwinaj.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/106a7560a6811a89d241eecfc2c53b73/92506148824.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/20078544f76331bd0bf78bf9c07b7495/79872232874.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=reconciliation+process+flow+chart+template
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8bc.bin
503a6956091b60cf7fb75c838458ec47dab241dd090dece9f1fe9518e9372bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BC 5356 bytes

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