Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b5d8663b86b095…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 15:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f179b8064214a3a54d39394ee5ee99f5 SHA-1: 4c0863720f60c2fe48afdc66fa5d8e6718913d6b SHA-256: c4b5d8663b86b0955497948b96cfc28ae6c0642294f7885964e7614ada6d8f72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute or host malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sportsht.com/userfiles/file/zekojejunosugilidofoba.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/48532fed89f669fea7238f2d0bb9f868/tarigitumelix.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/22108464441.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a965f71f2dc---nagolugizavofozirawanajoz.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/veduvikubebirix.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/sujirofozol.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c4f6dade12d007700862166c119133dd/95891174613.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kphd402qnt13ku49cgog9dqs5s/15589897822.pdfIn PDF document text
    • http://sam-global.info/files/file/66361134716.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160774911c49dd---81481313061.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e587fc9284---mulisor.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a3928086e971d33569eff069fbee8bb6/duwefized.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/55630500682.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e856bbdc950---27697166600.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/jatabexexogojagugu.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/21801999297.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/wodudifagazivobike.pdfIn PDF document text
    • http://mega.kz/media/upload/files/91938249393.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/be46t5bdf5cqqt9lpvk4gp8s03/tulejijumumimozox.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/gunudaxutabebew.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/68caf8f314a8b1d5441b37d4369541e8/36046689346.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609894a7bd011---10584802096.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kupud.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6e723c80c28ec48b12731f18e8859d94/59216986756.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/puxojoxiluzudavinipaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=smashwords+free+romance+novels+pdfPDF 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_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 10924 bytes
SHA-256: 16b775ceba3f41d15b378ee4915ecbd209eb9e86d53357cbd61b8546bfe6bc8b
font_01_sfnt_off0000e401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 17172 bytes
SHA-256: 00a269096252ed91d5e9444e5bab94c4800282fa16c2788e6093da242f5230e4
font_02_sfnt_off000110f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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