Malicious PDF — malware analysis report

Static analysis result for SHA-256 7696bdcd402c037c…

MALICIOUS

PDF

76.2 KB Created: 2021-09-09 17:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ce96318e28d13e18b2f4dac1bf453a9 SHA-1: 29a7e3035920304c2abfef353b91c0803d4b5bb5 SHA-256: 7696bdcd402c037cb10d46e7967980c85ed6318c103084b028c0865b7074f8a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with several URLs pointing to compromised WordPress sites or disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further downloads or compromise. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • 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://studioarchterreni.it/userfiles/files/30873702278.pdf In PDF document text
    • http://duetsepolno.pl/userfiles/file/85704412696.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/21755759875.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/76224028042.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d972204e9---gevutubarumusuxepozak.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/nimizagavosi.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/nezomapegodajopoti.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161330c65e35b8---wolutarivakarenexedimolo.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/36198192303.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/1065345852.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/35425080241.pdfIn PDF document text
    • https://tadimtursu.com/image/files/46590077809.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/32905712302.pdfIn PDF document text
    • https://baglab.pl/galeria/file/zuwiz.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090910318_148584098.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/sorurefibafisotab.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/noporoguwub.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/pazinitewenu.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/70166307895.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/kutufomofigixipupesiwi.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/95038133719.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac455cf04---givaferowifigovupolozurat.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/99457253516.pdfIn PDF document text
    • http://millecolori.it/images/file/18393212484.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376141995bf---30200408170.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/muwuruko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=adobe+photoshop+for+mac+crackPDF 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_off0000c484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 17632 bytes
SHA-256: 6cf250d9b28db34ebe4174c4612434e9334c6c2170c812c605bc0336a5b5db8f
font_02_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 10856 bytes
SHA-256: 94c520eb154292fccef38f76d8423af95db0c83f5dedae9c5273c8ed46ddc8f3

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