Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dad58235cb42c4…

MALICIOUS

PDF

97.3 KB Created: 2021-08-17 04:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc388c04d2c2319051a01ea7d7337d90 SHA-1: 93d76a629a7f1883c931b7b2615d43301a83fb83 SHA-256: b6dad58235cb42c49fe28c90ab25f517badfd1cf127303127b9e2d00b10d956e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, presenting numerous URLs that lead to potentially compromised websites or phishing lures. The presence of external URIs and link farms on disposable hosting suggests an attempt to distribute malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://chcial.ru/uplcv?utm_term=internal+combustion+engine+fundamentals+by+john+b.+heywood PDF link annotation
    • http://aucoindeshalles.com/menu/file/bisukolufukesajaboxi.pdfIn PDF document text
    • http://roocenter.ru/upload/file/waresarowonibiduvizuxaj.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/popis.pdfIn PDF document text
    • http://artospace.com/pics/file/31531632522.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a32f7653baf---98387217650.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/89282193361.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/15a3f004e14618f0b617927bbcf2e530/33182405602.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084215f4a61c---22708806263.pdfIn PDF document text
    • http://isgsrl.it/images/file/xajatojaputifipezuva.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/kokimejagi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/315119e0f720c04a7978595d7beba543/43472041616.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/xetaxijipinev.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/wejiteki.pdfIn PDF document text
    • http://drtamerturan.com/file/xoloturifo.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/8779680454.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/xujegomepinosebesukugi.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/28418229350.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608118a302121---8372703695.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/25874861415.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a38111a5744---38200418375.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/57991239227.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac65cc808d7---26803733098.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 11512 bytes
SHA-256: f673a96a4adf26465de021c2d57ed5a0d913953b79fc55fbf3fcbc84c186ea3e
font_01_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 1532 bytes
SHA-256: 2fce0366da0e12fb86513ff4f7e3f158610d3c90d497a2cf10316a6f9b3045d2
font_02_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000111c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C1 17300 bytes
SHA-256: c993b817beaa9fde3bccefb0a3de2c6b351cff757d285375ca74feae1bfb86d7
font_04_sfnt_off00012bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDA 1880 bytes
SHA-256: 8ac9d0bdec4a9840b1c9e2e76e0c12706e2c6ab8aa870cead9009b3523bb45fd
font_05_sfnt_off00013499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13499 25348 bytes
SHA-256: eabf5ff2469b576ff2bc73d2d1cf1574de248e53e283347ea74a0116e3716ae8

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