Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc67b4f9da639f69…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 16:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0028eab65f5a1d567481ae543a92d946 SHA-1: 4437aa4d347ccd143a8e7142e45a26471b9d4482 SHA-256: dc67b4f9da639f69caa84c459519c48f31fad73bab6777663c0a61a70c80960e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to various domains, some of which are associated with compromised WordPress installations, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://noospc.ru/SITE/files/editor/file/84258586575.pdf In PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/nepexemowovevusarebuxos.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/47524530042.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kigulo.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/tidenaguwukatumalibul.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/79559806457.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614562fe7bdef---31481542003.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/jadelozafamaz.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/27706452643.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/faviv.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/wobubunofufurefideni.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e741f3cc72---goxivi.pdfIn PDF document text
    • http://belst.by/upload/file/wazopekemidowojakotu.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/leguzulurapobutetubu.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/70771202921.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/mabelidofalijevug.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/41128041282.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/95316534426.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/57056102471.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/sawaluxowum.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/5mlr0lh0hcql2s31vjikt97hh8/33488353826.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/rifasodofajodoribofusudit.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27b95978e---guditogutebigimogagogikit.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140509ca090e---7918824705.pdfIn PDF document text
    • http://msiutilities.biz/documents/dotade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+record+part+of+screenPDF 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_off0000b259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB259 10548 bytes
SHA-256: 9e3b056ba06aac8b534ca2aff25eae6ce03236ea20540d48a4ed703eef332b5b
font_01_sfnt_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 15876 bytes
SHA-256: f70acdef575fdafaa6255a29c6cf80e0c7ad6fafdb94dce75959583e010ff712
font_02_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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