Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9c7142a6140cb2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 18:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01532a2772effa94f2ecb135b640daae SHA-1: 24949ea0436be4038e614ad54c9200ca1edd673d SHA-256: 3e9c7142a6140cb2311f7b772a390231918988139d3a608fabd7fbd9e2034fa3
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing a browser extension or update, a common tactic for credential theft or malware delivery. The presence of numerous links to PDF files hosted on various domains, some of which appear to be compromised CMS uploads, further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://bursaceyizgelinlik.com/images_upload/files/71737277674.pdf In PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/rurunibunoxarijixe.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/44375028927.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9ef78305---69825749653.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/vumatofofudedatalusapole.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/jasowojekuroniwoxoje.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/lplihe7rre7u90pl9uhsdsenu6/jafefexuxofataxenem.pdfIn PDF document text
    • https://interconformity.ro/images/file/68405261224.pdfIn PDF document text
    • https://unitjaya.com/contents/files/31816788739.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/20078316927.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/30613600021.pdfIn PDF document text
    • http://bndweb.nl/upload/files/49088071258.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/gokidukewoxetagaxejedul.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/70876247417.pdfIn PDF document text
    • http://halaljones.com/uploads/files/xolujakozu.pdfIn PDF document text
    • http://vce34.ru/attachments/file/jiritobi.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210906011235.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090420035073499.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/2962479911.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/selapowawiwutaneluge.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/47109134917.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/vejanenar.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dj5ivijjhpfd4hhc9e5t7vo08/nonoputubivafaxowefupufob.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/46089521723.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/56951964171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dove+emoji+copy+and+pastePDF 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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 17128 bytes
SHA-256: 8969f2aaa2e507065174eaccfb505535ef658cc404f977e90b5cb706d095f1d2
font_02_sfnt_off00011e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E13 10840 bytes
SHA-256: f6331f8855827658d4b66889910a9b786f3a2d8ea9216d5740adb80ad970fc11

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