Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c88d4abba00342…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 01:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9d63a5f7c41be16a024f6ed21f3f9382 SHA-1: 21471a86e0adbf60ac76590c4d1564bd3d6baaea SHA-256: d5c88d4abba00342ee496886870ac89b3789d2a466dc2b938de525a25a2cd34d
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing a browser extension or update. While no scripts were directly extracted, the embedded URLs point to compromised WordPress sites and other potentially malicious hosting, likely serving as download locations for further payloads or phishing pages. The overall pattern suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad7c2f2da---zojudesujibije.pdf In PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8aeqrnfjmceav8hh8fo43k3e19/fiwodatogekijoxefefe.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee1d7de3cc---mipan.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/lonoxojenafusapubok.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/86277949354.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/13973903927.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/f0ac19f8932a55d57ceca5f914f977f7/21886189100.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/94847628053.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/gimuwixizapinawidelib.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/65746289680.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/jusolana.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c295684be31---zejanotesakasosovanasuf.pdfIn PDF document text
    • http://srhs1980.com/clients/877094/File/36027868331.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/mujoburezomeridokusup.pdfIn PDF document text
    • https://esz.jp/img/editor/files/49453731493.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/1565132182.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/vepamirivodexojuka.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/93008526600.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/roraselogajiwulo.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/6326126423.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/56994009824.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/35434913101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=prevent+pdf+from+copyingPDF 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_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAD 10768 bytes
SHA-256: e6636bb1dd6a09575f2ce51554a75a1e61606385ac7b8badf901c5947d613c68
font_02_sfnt_off0001133a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 17792 bytes
SHA-256: 8640ce961b9fc099c0e22a1870f6c04742fc50a4192affa046e4d0a8b4b09942

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