Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d83ebba81b9fdf9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 19:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e32a03c493585b8c36b4a25d7549351f SHA-1: cc29896899631616515c9b6f79c2a6962cffe197 SHA-256: 3d83ebba81b9fdf945bccbac3867d666f58ed52acae271d4681d7861c3f07173
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://andrenickels.de/ckfinder/userfiles/files/zudojilevutolowe.pdf In PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/jifokasedew.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a0e17fea28f643542f8b0f2d1ab75c6f/kafifudikolupejunirifaw.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/wuzebizu.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/wupafokox.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7f164bc93fd93b65afc424e5b58dd922/sefidojitiroge.pdfIn PDF document text
    • http://cycling-software.com/files/file/50026092912.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/24448923284.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6c7c58b6---latitikeparowaka.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/78113132242.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/lumogeme.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/64080963099.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/jirona.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/tabibanuborezeladawof.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/31503429088.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/gabifemimefifevika.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/22458478856.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/tumazenulokiboti.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/bukutawevibefokuveriz.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613748fc91e58---94333168605.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/tabulawoxu.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/vawarutozaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=our+lady+of+121st+street+free+pdfPDF 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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DB 18908 bytes
SHA-256: 8a9dd274ef15aa7b16ad18627db4528c44cefc174011d31a48094f05a81654f9
font_02_sfnt_off00012265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12265 10704 bytes
SHA-256: f81c8320e9e7bc66a81d93dee2281797d0c8052bb3aaebf49e43ee6d9ae64212