Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a25478fe04024ad…

MALICIOUS

PDF

73.4 KB Created: 2021-10-03 13:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d7a3f4e33ea2a4109dc3679ce7d57991 SHA-1: 2eacb737db80a7062179e37771786cca064f155e SHA-256: 3a25478fe04024add00563ca0af7ea97f64c499d6d205e29f915a189e97f86c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. These links likely serve as redirects to phishing pages or malware download sites, indicating a malicious intent to lure users to malicious content.

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://philabc.ru/uplcv?utm_term=things+fall+apart+summary+chapter+12 PDF link annotation
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/kajinikikedifewawok.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/58832250617.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f91614283ff1981a76f298dfcd972b8b/20545686736.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/28436208622.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/begavatepajogi.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613229dc3ecdb---67231902412.pdfIn PDF document text
    • http://mlight.cz/archiv/file/69205964543.pdfIn PDF document text
    • http://chinalabware.es/d/files/bofot.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/95316651826.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b0f3465a4047f16d4c97d9f35a3c0a4a/wojixatunom.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7af243869fa658a0a3c50f9b4d884e01/11124135278.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/mawewusuxekenowalolixox.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/82525669793.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/23546531701.pdfIn PDF document text
    • https://ivanamihic.com/files/88406608517.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/gutozenurijamoxavaralito.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/615268181.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/jaworalesikijilefezogi.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/4300734311.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/13045736985.pdfIn PDF document text
    • http://henca.com/files/details/file/10189297912.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70ce593e1---dineverub.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/71399331489.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/dedateseribemezudifepalem.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/66362396708.pdfIn PDF document text
    • 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_off0000b6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CE 18360 bytes
SHA-256: eee9750ded07d55c2f41e6c4be04936428e96b8c539b668267b6206f729d23f2
font_01_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 11156 bytes
SHA-256: 29e90b95b634b4e41c4884f8b3be6705e99f35e3207ea10f09b80631f6146b2b
font_02_sfnt_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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