Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e4cb6c83de482c…

MALICIOUS

PDF

70.7 KB Created: 2021-06-24 21:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c00c3dbef715e417a35e50787c2b0d7a SHA-1: 99af5088156e79b35f65a637cd8f33b181243f9e SHA-256: 21e4cb6c83de482c87c8933e16657bbd7afb4dad89ff4f31f3e55bb16c805227
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 of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a 'user manual'. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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 https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5025124ad---39466711670.pdf In PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/40594a4b5351c383be68d1f96b88ae88/zosulut.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84d1cd34ca---17189740937.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/19599759724.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210602190803.pdfIn PDF document text
    • https://avela.md/userfiles/file/futotimafuxo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc82c5c5d7---zibixokobu.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/20026219483.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/majigefefogoj.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac093b90456---48220749013.pdfIn PDF document text
    • http://gyobel.itpublic/file/parulusu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160866affdcb51---53269494656.pdfIn PDF document text
    • https://daismene.itfile/66094296368.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160865fbff3b9d---kolufa.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j4iur2fndvtiiavn671pckc7o7/naruwofelu.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/kojavafelezabenu.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/fzgW7-mxBc0/uplcv?utm_term=towa+ax+100+user+manualPDF 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_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 5132 bytes
SHA-256: fc8470ee10b47e0d0b07c92bb486de18d3c3c7a509cc06f654cdce74def23ba8

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