Malicious PDF — malware analysis report

Static analysis result for SHA-256 b443ef90c98bd67a…

MALICIOUS

PDF

120.3 KB Created: 2021-06-29 13:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4e9dff94c7bb77812e635fd03c20f32d SHA-1: 895210cfbf56024c5c050b80740daabb40e62c6a SHA-256: b443ef90c98bd67ae1f0b62d41ed892f68a9699f5bcb5bd05cd5934fb9c82526
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crysiq.ru/uplcv?utm_term=conductor+of+the+underground+railroad PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3e5b852f4---manesoxutopixaji.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/75d21f54cf43844d12dd749c4606e3f2/zupugosizefexena.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/jobarepezabojifewakoda.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9d449970b66b81e5b81b33925366d54e/mojal.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/93753427874.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210604_979CF028761CD7EE.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c798b058d0---15282062387.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b80b703b814357fcc7c59b3f219a53a1/41774808680.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850bc0a9e55---talaxijokifekaxejodanako.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/317098807c28ddc97b73a101310bc229/27108742436.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160998033995f2---7706950140.pdfIn PDF document text
    • https://dhesient.com/media/kozarosoliwojexenofirasoj.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609e07ecf4017---loraboguwomexe.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b937e8e067a---puvepojugajezegawu.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/f70e5357afda9d7910f26521fcfcff93/29076609881.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a094d5f649f054f20837be3f3580e278/vokerufive.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/759fde2077cdd1a4127498c14b9fd478/896641725.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/86f443ed8a6b7a4fa03f6dda0fd61c12/zelanipawapobileju.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/je0ocdoqqtf223c86dtaksjf52/77940017681.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb5cde9aaf---xiwibagasetuzijoxufub.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8b0d5cf78bda4446f3104bd43136703/pivesegixizikej.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee2d09e9a5---11053172081.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d395160f9---pizobofuj.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/80304140841.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/bejabufudizejos.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ebe98d7f0---nonajeji.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/22967823745.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160750b72867c4---75731820000.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000174a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A1 17596 bytes
SHA-256: 31e3642e4e48f123d1f6813e527c7c032ad77f4f5d5142c6a4343bbb935ea457
font_01_sfnt_off0001a300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A300 10716 bytes
SHA-256: eefbdff89c0410e4bff5dfadf5a6358f7c0364ea098f4cdb204c6924d1fff151
font_02_sfnt_off0001bb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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