Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e723a17f82dbfd…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 23:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 689b71f0fa28d50d09f38dd5e404d317 SHA-1: 7e132328e1973b877037fa4cc50b2571557bfe2b SHA-256: a5e723a17f82dbfd2ef88640c1d5c2224ed02b26f72b4be7e361fb25cdecbe87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure suggests it functions as a link farm to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/6fe00835ec8f326bdeb150f81d4b3058/zezojatokifojajow.pdf In PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/naton.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/kebexugudasi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d713eb225---bepitodib.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/lewabuwufaza.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e64bb3df145---bumumekilefujivud.pdfIn PDF document text
    • https://miet.hu/kepek/tubatabapazuta.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/15671942671.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de27b6da2c5---82144174975.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb870da424---togozatadotixodirone.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/49389233046.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/12556410160.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf499a34af---11980795985.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/78273852388.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/47901926830.pdfIn PDF document text
    • https://trunglamdecor.com/uploads/userfiles/file/25736278845.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/10059975394.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607719c33a6c3---nufowusutipobalagefapir.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210808174545656053jiupd.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/xewonaterulejete.pdfIn PDF document text
    • https://sharenkon.com/files/selisatawimeza.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/34m56odqhpms2lfnbkp8buaak7/lutinotixutowigemesawax.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c5dc33d622eb5659e1ce764fb3d5aa2d/limef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=express+scribe+user+manualPDF 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_off0000ecda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 10644 bytes
SHA-256: 3b1970be11d99e9ee5dd901237601ff1a4ad56415b34e35a359f3542ed98948e
font_01_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 18252 bytes
SHA-256: 6830b36b0d2e51a3ea3cd44045beccccab884d08cd06e2011640b3eced9c0518
font_02_sfnt_off000134f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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