Malicious PDF — malware analysis report

Static analysis result for SHA-256 940eac994519cec1…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 11:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 56bd6bd98e173e6028887ae34dfa7f07 SHA-1: 3b0775e0f2c354fe4b68121be6c8887571721b04 SHA-256: 940eac994519cec19bcc07899f8e6b76c8ce7d39de83e88ffb6b0c41c26847c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised websites and disposable hosting, indicating it functions as a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not fully analyzed here, likely contributes to the malicious functionality by facilitating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=reading+solubility+curves+worksheet PDF link annotation
    • https://roweryelectra.eu/app/webroot/uploads/file/16224725004745.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/rokilarexowokul.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/27819950754.pdfIn PDF document text
    • http://palami.by/images/file/54174860400.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16103bbd0341d6---13577666338.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f7c66e6db---1496886808.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/tojuluze.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/fosiwanirulabuxotanawod.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2dfc7af5db6375f2a7123068a48badfe/tuziwetesipowok.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/22b313fadb2b05a09e72c88527d5b6ed/17072482204.pdfIn PDF document text
    • https://aaaxxion.info/images/file/10405966775.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/52250437330.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/18849610992.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f14a15b801---julokunusibav.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/498ecdc0c397904e4e750bd0d553a769/teziwene.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f52a33998---58598790033.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a0271760979b244dd81af3ee4b137bb0/95411118918.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/96815081650.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610889952f288---nojetogaxewerel.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1830225af2---22149693953.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/buletelipufuzumagukeg.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/44297603666.pdfIn PDF document text
    • https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/91935289720.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/glsn6a2hq3pjuume81mmprbcpd/46563882572.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_off0000c1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 17072 bytes
SHA-256: 7598482eb59717d5d53ade4f5c0f2c220628a61e0520e8cbc00869ebe7f6561b
font_02_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 11292 bytes
SHA-256: 5c439c5b776c106ddaad2c8d3f1c6a6b716314b3992feea87cfe79e9b0d510be

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