Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb027e12d209bbe…

MALICIOUS

PDF

78.9 KB Created: 2021-08-27 00:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c8794f5b009ebbd10d353577594b40f SHA-1: 0128e11f7ceb061f3b4580d710b696dd76ac39ad SHA-256: 3cb027e12d209bbe86f25bf71e118dadc86103ef70af40df9fbf2d97998905da
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs pointing to disposable hosting and compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest this document is intended to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=the+monkey+business+illusion PDF link annotation
    • http://lakesideterracecondo.com/clients/41361/File/rafuterosasoguke.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/sametimitiwuvalavimanefij.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/62258593830.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9f23ae50---53475874041.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839f1351fc2---42231499154.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/lakulivumudonenevo.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/071ea80042ca01135d00d866a0ab33f3/tavuvajaboporuga.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/86000532120.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/86786409939.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/70908920041.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/rorinibakabuwum.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c36911c9b0fcd256c1cc1830252c34b0/giwenurov.pdfIn PDF document text
    • http://precisao.net/files/files/dofidibusuzef.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b2dece37bd4a514ed2e699cca619d263/rosakegigimo.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/07tushfo593vtfjhj3fdia840j/lolab.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/s3q7b82bngvpl9c5teb8sot8lv/71034852674.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b514ba76e9---34648427077.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/52914926988.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/55770150065.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160823015075e0---dusojazuwedetuju.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/18830583607.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79c8cc9260---37888673676.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd42504d39---togiso.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/zurusopakidijugesifosuw.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_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 17160 bytes
SHA-256: 23f1902fac765c84035d88efeb6bec2572900efc2608941ac308b5d48f36d806
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 10420 bytes
SHA-256: 3d42d475b6dff326fffdfac76862df14a0f3c6941f669f9ec2efca32440646ec
font_02_sfnt_off0001156d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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