Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a06400e868b151b…

MALICIOUS

PDF

104.9 KB Created: 2021-07-20 09:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c63b6d0f3c08fdf3ba50999c0025f54b SHA-1: 63ae3a7fddb2ccd5b438b60eb0702ee945f0bac6 SHA-256: 5a06400e868b151b7c4aa6042dfc15995f101449976e9a96a9612ca98daf05ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160845d15b1f64---livawefozidovunako.pdf In PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a089352a0934063989bee0df594955d1/61329649957.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/62402233223.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdfa43a069---79374975243.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/20cfbaf26e394ad3771ed7835db0beb4/29410343848.pdfIn PDF document text
    • http://maidichike.com/upload/files/13207737939.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jubalu.pdfIn PDF document text
    • https://corghialberti.it/file/diladosikuteju.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/fupemanupodop.pdfIn PDF document text
    • http://temple.mo/userfiles/file/bamazanugemot.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/nrtoqn846os5haep6hq0hshkv2/joxidejebudozamo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab779ae7362---pefakimevaso.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mtp6olq2gdc12mu5u7pmnf55g0/bonatufovirupomoraminodi.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b9796bf8fd1e1a74fab0aa332a2ddd9a/86987858210.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/10206707726.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/nelegegugebapidofapajuwi.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/54946123611.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984233d608c---25151795069.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/83354862e1d312b543b36c4ff1a4501c/tasexupokotetizewo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa01281e7b---migizotapikibuzenesutow.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086f69871be3---sinokegofebujibekof.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/gojegowog.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972dc44c7ed---48036519565.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/80582838481.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/43456196170.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b659aedad0bf4c7b0d851b00f5c663e0/99816705183.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/9227252007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=save+the+day+meaningPDF 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_off000136b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B5 10516 bytes
SHA-256: 8074be2f296844f0e3dc03d3212b842962ffd84940b3b4bb126e8dd8a846ef51
font_01_sfnt_off00014e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E44 18164 bytes
SHA-256: 4a7797b30ab5574c8ee2b08042c722804029410f78926a284422784710a679e5
font_02_sfnt_off00017e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1