Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb8264bdadc8552…

MALICIOUS

PDF

64.0 KB Created: 2021-05-01 07:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0420b2acf5282744cce17bc4a5c45bf7 SHA-1: ca3535a7e3a89163641b4b395a676a55d63c700a SHA-256: fcb8264bdadc855209998c619e98256fe5e9abac44482811e86b041363bbbc36
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress sites, suggesting it's part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials. The document body, though heavily obfuscated, contains references to 'banorte movil' and 'apk', hinting at a lure related to mobile banking applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8461

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://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f205b2ef---zupekufugoluzepewij.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/30d8998542704047fc1361d5e401c8db/68418387873.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f2ea1157---84461438019.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb39d4a4c---xajik.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/a57380c92871970f0cb3ec61c9f8127b/bizik.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc26909201---xutisolodetibidiwevav.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8891aef4---82516357618.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160742f7b8671f---81979469749.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/27oe9mgv6u40ifjps22vticnu5/60084891238.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607da82e1b136---pudezubugovorare.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bc54f8237f59b6d6b87aa1ef8ffb4aa7/86234088505.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d08e0196c10d49c7801d89c747353518/45973287211.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/505b57ded34b3b08e77527a9aa498d4c/dodozoje.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a17666917f---vegopowelidoz.pdf
    • https://airshow-bg.com/file/pabikokome.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=banorte+movil+4.+4+apk
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b0.bin
21270436f884dc20780301d3e3c28b18334708688feae5295753485f48e098c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 4868 bytes

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