Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bab3c65234335c…

MALICIOUS

PDF

87.3 KB Created: 2021-08-24 05:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbd8e87db5f8ba3fae48a48e831f4818 SHA-1: d6a1321bf28f3963e13f1a88ecfe562642b5ceca SHA-256: d4bab3c65234335c21a8241cb6c43c987d2e3e4d9b8e74b4143adaed0da7ac96
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing malicious software by masquerading as a necessary update or plugin. While no scripts were directly extracted, the presence of numerous links to potentially compromised websites suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • 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://ingfrimale.com/userfiles/files/40669661926.pdf In PDF document text
    • http://zhfangyuan.com/uploadfiles/files/favekuzovadetenap.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/51358863043.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/30591729585.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/nupezemanusuromenatoga.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bf159e4bd2d---nepaziwudewubovet.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fqf6haqs9uh1c1kp5i06p9hho1/95520147511.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/62575656524.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/5835223b9f5811b0a47ef2f86ef7d6b0/bujigapiwe.pdfIn PDF document text
    • https://maturana.cl/upload/file/37302071289.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/xubulevorupemoxababe.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/nofuvegawile.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/sukotabevolusonufi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a365502d775---10655786436.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/19bd61b63fc47143f1f1e2b2f2fdd204/84121337459.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/db4f1ad263259516c23553357e81575e/wifabetimuwidajomu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a161c347d545c506bd75648f96324699/55348605635.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-15/20210515141936445130.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/14078837511.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/fuwuzejiru.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210601_060815.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/godebujar.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/sosuvabizuzok.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c995d9fa2---nudoxodizaxuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=then+in+afrikaansPDF 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_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 10104 bytes
SHA-256: 8d3019dd36c85f99bd4168f5c99b555c9b29400ab46a207cf49e51053cb1c974
font_02_sfnt_off000121a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A2 17212 bytes
SHA-256: c1e88c4969b9dfdaecd3866e112d9ab7c1c554e19c50a4df0b294c6f343f3d2d

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