Malicious PDF — malware analysis report

Static analysis result for SHA-256 83681a893bd57dae…

MALICIOUS

PDF

70.3 KB Created: 2021-09-23 06:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad518d5204841b83cb129d1771b0b100 SHA-1: 48d6829bc18d20c414fea4d6b2abe750339a0d5a SHA-256: 83681a893bd57dae9b6102a9299fce71837e55a64bca37be178f52d201f651ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://dennismaloney.ca/upload/editor/file/sexewevawez.pdf In PDF document text
    • https://suacuasathcm.com/uploads/files/73348630688.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/zejagudefa.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139160266408---vaxatewitovitav.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/d1uspacaimrg1hl61rnq8v9p05/xijigufatuxifajado.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/pisirek.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133723a70866---detusajafe.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/fuzijalo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fa92f913713f2bf579e07b6428ed4dab/92410406404.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/bokiga.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/lowikib.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/058e0c2ca3b018186c1426f35ea5bc9c/befuvek.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/2366610008.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad2861208c---52569651963.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/665eda95f295959710f821ab9f7ed79a/detilawemuvofupar.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/69024673791.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/53724515947.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/misitilafu.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/5144222736.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30673074160.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/69284556086.pdfIn PDF document text
    • http://poliinc.com/upload/files/13291868188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=redmi+note+9t+pro+antutuPDF 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_off0000b0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AB 16680 bytes
SHA-256: 43a2c18287144250272b9f632b20f9006471b65bf89b5c93c9480aa99007e284
font_01_sfnt_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 10652 bytes
SHA-256: 26c3ecd04dd9b6d6e5ae183e2ff4bb04260769f790c56070c1294e9f8fb55baf

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