Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c0edd3fe39b1c8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 06:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77b9851b86eb57af55605f01541c240c SHA-1: a90fc83b06f1f4097e96d45d9bc07325f5876a6a SHA-256: 87c0edd3fe39b1c8a0de89f675be97eec885a9066403c63689d059d25ed4aa22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c56009b19f14f24bead92cb6dea076ed/62170457471.pdf In PDF document text
    • http://bandenplaats.nl/cmsimages/file/34906746122.pdfIn PDF document text
    • https://susta.vn/userfiles/file/bulitigogikoguketef.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/nifemujurodobesad.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/nugigujefetilo.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/kivibu.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/gokinofavolet.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/kinafe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a7ae9bbc---71483879709.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d67d6911a2f---ravilamatupoz.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/zuvagixa.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/gexasal.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vubegixudojisi.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/97i0l5sh8jua062hl3khb6ha42/mabokunabesupapefatalaxe.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/kipuvadilajanakuf.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/51202174038.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0dd4f816c2b605baa811ff48bf609a0d/kipedabukapisaxavesa.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/ce515429143010fa865583625a6108fa/17113575307.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b62963e7---85771872527.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/luvidemufeli.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/3ab254b8ee23bb811458b37d68efec93/20506071225.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092edb37e157---wuzitizak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+buy+a+workshop+in+bannerlordPDF 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_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 11012 bytes
SHA-256: 29535f3a3dd54f1ef65e9356303abf08732f7527e20c5376c719e2c3de3b70c8
font_02_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 17404 bytes
SHA-256: 99565fba71bedc7f7b34f5bd7cc249f138ca066fb4d1de7e9f07035d1ce16d04

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