Malicious PDF — malware analysis report

Static analysis result for SHA-256 8444936ad7e4aa8c…

MALICIOUS

PDF

90.4 KB Created: 2021-07-03 03:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 66e22745ea49ff45d2d9326668238b7e SHA-1: 2ef6d8705d6c1cf9ccdba2b85df22027ba345b67 SHA-256: 8444936ad7e4aa8c2234a3f94a0a71e250cc59c7027d107a138259ffe80ae099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/0509b683c93b63aef8bc3fb5157b48b5/rigoxijarixirugazaxezisaz.pdf In PDF document text
    • http://danchrisjewelry.com/userfiles/file/58586791480.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/matalimesofotekuwim.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609145cc331e4---mikovatosepuvol.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e16fbd2be---79223773022.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fff7483ca4ddcfb69408a8333a435650/23279294468.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/34375674622.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c506bc5c8b---23008205461.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c061c905ce0---52158861795.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0391b68af9cdce6e30e8dfca52cac340/judevuzilikuwevepusabipa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd125eff5---63046237809.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607886f077702---bozufaragitiduzijobepo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/1816668050.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/57345998897.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/53659798678.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/50fb402341c7af77db3b0f8a1fdaf4bc/vadezigenud.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/subagivagoledawazuve.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2384ce1bc4---biduxeliralul.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mblq8dcsdr9q3v2l4ccpf01et7/87677114785.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/sefudexubimakotibataxawop.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/d7c56b8ee6fca7824a2489c2fff0e695/51302811336.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/eqm8pue5as56krbavadad1u062/98349016241.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085e5d4788a4---72911288811.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/58327360801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=which+painter+invented+cubismPDF 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_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 10912 bytes
SHA-256: e34aa21d0d5cebaf023822c1d3d3ecc78db10c1a9a68684630f1d1f74b7093ac
font_01_sfnt_off00011a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A26 16208 bytes
SHA-256: b1b3cd6c90acc05744e12ecf20783a9e4bd86db7f291f5fb00d831258b7a5133
font_02_sfnt_off00014419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1