Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a760034848b4b90…

MALICIOUS

PDF

66.8 KB Created: 2021-05-23 10:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ef8c605ec7d846dd0a1247915806b5e9 SHA-1: a4cb94be7fc2e52690936f324353af070846ef81 SHA-256: 4a760034848b4b9049e9fcc9d7a18052da468af0bf86989867a1eefda310ba24
154 Risk Score

Malware Insights

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

The PDF document contains a large number of links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or distributing further malicious content through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8402

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://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2fa591e50d7b93aea09b4aea2bc16307/fogapar.pdf In PDF document text
    • https://alice-immo.com/userfiles/file/58657349740.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/9p251chmjoafgv0lo1mqi2ma9r/90727294555.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/52fu35fb4aldu38aki1tdggo3j/4388974303.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/xerizerobupufinefab.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a88ffccb732fb53a2396897cacf7453d/zumezub.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160772768ea19f---60688426082.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160892a82eb6ca---juworerufi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607100fd2bc7e---vunadivajalolawani.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b46a508927---sedesukozezivibogodilup.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63cedb39e5---tunerokesejogukutelujoz.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35e8646c1---25293325943.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/gosebogafovazepodefu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff3826d26---wadifonuvekovujoduso.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/r2705urs9bn7fhe363ml03dbhg/22788984395.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a75fb532bb2---21758183369.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/3536499708.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+25+modifierPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 5384 bytes
SHA-256: 3dd1c6a9228aa8b1cf176f73996c246f69046a111a53ee337f919b73b3c623e6

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