Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea4e478ec2fb437…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 09:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5fe4af5e08112e09e26e2e36eb28efa8 SHA-1: 110f8c8f5b1bb03e405fa9f51396036d2a35d8ad SHA-256: 0ea4e478ec2fb4378a4771f728411a1850d9f30bebbe9375a435199236562c0b
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and presents a social-engineering lure, instructing the user to install a browser extension or update. This is a common tactic to trick users into downloading and executing further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, and the embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://epmachine.ru/d/files/vudopasigir.pdf In PDF document text
    • https://purmoradiatoriai.lt/images/files/lerimivafulalufimometaso.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/69531327966.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4215bab7a---9169746872.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/77735947872.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/purixew.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/bulexoxumadanagavetaka.pdfIn PDF document text
    • https://j26clean.com/upload/files/61010713327.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e5b26fa45---90512272128.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/dumonutivojarufe.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/wakiramatulunob.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/bilezibefazemofidalimuf.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42bc858a7c---43138639926.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160855870ba162---ziviwuxin.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bidavaliperoxevizozida.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab92c0d44---luzifuwemezenolun.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb7a732ca---77641021539.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gaxadogezake.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/fativutam.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/4pmudqmj6id7ak2v7telq9e4j6/favek.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/lanesigikivizexijuvaxo.pdfIn PDF document text
    • https://tadimtursu.com/image/files/20251819586.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ojqck1npaeorgt3fqt0420vlfk/ninifojeji.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/72667627001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=new+tamil+movies+download+with+sinhala+subtitlesPDF 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_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 10784 bytes
SHA-256: 84a28e080e54a2d4fefb07ba595c260c49480140e5ed9449c47055e591c7312e
font_02_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 17664 bytes
SHA-256: ac4033a9740132a37361fb3b260e6b690baaf1692e4e1a0df7aac84e6f62305e

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