Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96e05a515b9817e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 10:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c23317960806ceafe50e22514870bf2d SHA-1: 479a2332aa8f80ff4f7ba4cf16173a86b2921061 SHA-256: f96e05a515b9817eedb7c96970f40f332d94e18c1713acdbd4169310106bc94b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ferropula.hr/files/5795138862.pdf In PDF document text
    • https://cargobull.cz/res/file/29273450590.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/faxano.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/31750787140.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/33438913950.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f58c14f5e1fcfae055a2425100b2fc76/rulorunofax.pdfIn PDF document text
    • http://esistore.be/userfiles/file/41365359599.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30828efef1---57157670071.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/dugamezaniwebezisufe.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/zarezasevaf.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a119281f90d---66673356123.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/nisusogez.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/nojepovodudenivilaja.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/20682254646.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/talobinuvimopur.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/up79e6vg71r6p640qk75p8ucn0/zizadujezozes.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed28407cfc---94567258982.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc9c65b55---nelimozewike.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092e86b6b2c0---gifirugugajokalivimuvala.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/kameli.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8ed73053---vomepejuponef.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/b37c8faf1cf2c0a0975450c8a745bc2f/rikevobixumodusanelizew.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/19157777716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=baby+first+poop+in+wombPDF 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_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 17868 bytes
SHA-256: 78094bbe57b1f33e4f78122f877f3e92aa4b5b46b936fdfd0414f191cc464ce5
font_01_sfnt_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 10736 bytes
SHA-256: 3e7dd4bee17844338560c6292d6f9c38b752ef07dfc2d14554952f031c334114
font_02_sfnt_off000126ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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