Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eca4e3d8d05e105…

MALICIOUS

PDF

97.5 KB Created: 2021-09-15 23:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1d87dc6444aba81ad492931f48b27d2a SHA-1: 8d3c10fcf41148893a780fa4fe83cdedc64962a5 SHA-256: 1eca4e3d8d05e1057d770e874ff8cd5a0065da5800f5b27062b2fde3413b6f2e
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a phishing and malware distribution lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser extension or update, a common tactic for credential theft or malware installation. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and embedded URLs are sufficient to infer a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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 https://synerhu.ru/uplcv?utm_term=android+change+soft+keyboard+language+programmatically PDF link annotation
    • http://turchifiltri.com/userfiles/files/86703338206.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/7506386827.pdfIn PDF document text
    • http://zamgph.com/uploads/file/091015122858.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161416accbb39a---91836062599.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/voguguzesumirekejigotiliz.pdfIn PDF document text
    • http://jump360.co/upload/files/20210913233001.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613520faeb90b---22940608770.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/30172641690.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99db9ed16---8240221379.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/wupazezer.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/68000894834.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/52892012939.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6cef843ac2e0c04f3cf7d146d2019578/murulizowujabenires.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309f0e7c3bf---42276465677.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/lubufelunek.pdfIn PDF document text
    • http://all-premium.com/user_file/files/fafelomuwuj.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/d3va1a4qqffneecag2p2eh3mvv/66110902757.pdfIn PDF document text
    • http://school15-tyumen.ru/f/72627708908.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/50700218712.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/tudenezox.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/31280132543.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/79094636065.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_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 11492 bytes
SHA-256: 743d750e3a568c6fad6478b933c531bfdad96d19b1ef3005ab76619ed454191c
font_01_sfnt_off00012f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001473a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473A 18476 bytes
SHA-256: bb198393f5b47d0ea005036d512a7dd6b087ff8a42786968afc7a90e7aba9911

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