Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a08b00603a9afa5…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 23:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b31aeefe98116dd6f8bf96de2102e650 SHA-1: 534224de873869cf79067c9011bd9c66ca65899c SHA-256: 0a08b00603a9afa58d34e16a245f3a17b20df1f54bee115495a50fb6dc7ad369
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to PDF files hosted on compromised WordPress sites and disposable domains. This suggests the document is part of a link farm, likely intended for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/zilozoto.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4c42bbe32990e49c0b61ad6df53e989b/55495199611.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/56d2b1491ad9d6c143d2993227c49a55/gelibajilek.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/1672777084.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/10231578268.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/bisuxujumuf.pdfIn PDF document text
    • https://badoza.net/userfiles/file/sugifexanejakexup.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/38380103142.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/jewabelepovagigasaxud.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99644321b---92175015608.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/70640669083.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/59775832145.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16141056914bf5---gapiwamatokopup.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/90806608235.pdfIn PDF document text
    • https://bem-sa.com/img/file/14163987485.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/bexijepilezokep.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161412f07124ad---pajexora.pdfIn PDF document text
    • https://n-tlg.com/files/file/7078778804.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/93997227479.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/71699301096.pdfIn PDF document text
    • http://robedecreateur.com/img/files/79253260595.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/nobamajakazewatuwu.pdfIn PDF document text
    • https://shidoremicrosys.com/media/sumurigijunudadorefegevu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddee3455d8---57254498445.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/73846901250.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/bewajoti.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tefekuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=zombie+city+survival+modPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 10812 bytes
SHA-256: fd7367e815181098e04d4ac7c9e66361e0f0a32e731396b344e0c1c805fd1e38
font_02_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 21248 bytes
SHA-256: dce0a6389987ab77fc566441ffe6720de648b8239aeafa171765854321bfb79b

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