Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3aa5110b62cc68…

MALICIOUS

PDF

88.6 KB Created: 2021-09-16 13:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 387850f684d71ab5c5ffa036db002a82 SHA-1: 1b5864abac07a83f81401658ae476ca9b2270843 SHA-256: 5d3aa5110b62cc685d6f2ea181f78eaabf9bb460ee22483b6467957cd2e1f49f
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing malicious software by posing as a necessary browser update or plugin. Several embedded URLs point to compromised WordPress sites and disposable hosting, likely serving as part of a link farm to distribute the malicious PDF or subsequent payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://davobio.com/upload/files/65918181746.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9ed30ee9---36887869374.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210902192143.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xivanaralemowo.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/bupiparipeben.pdfIn PDF document text
    • http://xfswchem.com/upload/files/lufolisirofomopubul.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/givelijuto.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/vugufazazakivutumigatilu.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210913172529.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0c0e21ed---gubewujekuzoso.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/12229350855.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/devokikebexozi.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/masuzopuko.pdfIn PDF document text
    • http://synphabase.ch/upload/file/raxujevojepadu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161343ddc752dc---7365867874.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/96077386134.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/xulam.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/sixunofem.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/zuzawunenebim.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/40136539182.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/64126505028.pdfIn PDF document text
    • http://sswjeans.com/files/43824363002.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/kotezuxosuwefoduru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=chrome+android+87PDF 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_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 17960 bytes
SHA-256: 86541669c42e5c2908553afa79d05b4355018562122a612dbdbe4ca36ee0f7b7
font_02_sfnt_off00013d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D11 10492 bytes
SHA-256: c2a980c9eb4ebc2b8115d6e8ce5ec0c26e5a954545ccc0a5b21992bc10645c74

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