Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4ca5de34568816…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 05:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2bd1053f972372d341628ea022a05b6a SHA-1: b873ff6a521581c099af87ec4b523900ac90facd SHA-256: 8a4ca5de345688161764bc23039b040d4ff37fde4c8426f5fe010bcf66fdbc69
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links, combined with heuristics indicating a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609215d78b3e8---2181177743.pdf In PDF document text
    • http://ansonseatery.com/uploads/files/9567433357.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/buvev.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/79420501601.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/86881778961.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d23917d5---zijenunotanij.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/23693407655.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/dimijuzelotipo.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/95871368624.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/gefim.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/nemumiralivelanefijevok.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/levikomofoxixivavaw.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/roluresuzolibaxo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076fbcc56e93---49513846581.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/monubezimikorugij.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/fubezedagugomilikaxim.pdfIn PDF document text
    • http://builderall.info/userfiles/file/22735160838.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/furanaluterukebofedolugob.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/vovob.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ubut042asg3vtb8ck8sh4vktjo/kuvuxolipurudebilozud.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/darazuzesanirirafeg.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e55e7a4be1---87751636795.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec14f9fcf9---lulumujikilo.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0a4cbf1e---77371022845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=reading+text+and+answering+questionsPDF 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_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 10856 bytes
SHA-256: ef1e1080f9b00ab83c969e349bae82cfc307811aa8577a7643d56385ca236166
font_01_sfnt_off0001097c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 17872 bytes
SHA-256: ffa9ada062ce64f873a04fb3bd0da7d857e9836c821eb15445db0f8541a88752
font_02_sfnt_off0001382c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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