Malicious PDF — malware analysis report

Static analysis result for SHA-256 734e9226e926f15f…

MALICIOUS

PDF

91.4 KB Created: 2021-08-12 00:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16cb312d61fbafa2d7b810d4d8308421 SHA-1: 21f039183f7105891f08468b99df5d9520afd7a5 SHA-256: 734e9226e926f15f6b3e02d48f986007cef190ac25e2f2ebe0ee07e255bbf8dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to what appears to be compromised WordPress sites used for hosting malicious documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2da387944efef09dc987deb5fe5ebddf/39670586313.pdf In PDF document text
    • https://africanresearchcenter.com/userfiles/file/deruvudopumik.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/13706936366.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fccc8f2393---45728541803.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a2b2cd21e---2302340597.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d568a9004d---dakavulo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922c611c3d9---3091234483.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/jinexagewokamegezuzejarek.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b802efcb9b5---maxujeduvelotigolowa.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0a0bc9ea99c1c80121dcf3c521545c02/zipopepomikojurixovov.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/863cse0nt5imrc70f79ignha51/semadukuzumaxarofuma.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092f9b463f4a---41364219557.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b94d87c1a3---refuzoniribenepanifiw.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0477e955f9---xepogumodewunukapodeko.pdfIn PDF document text
    • https://ovalpolycoats.com/media/zipabuvapowir.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d712e5cf7105060e72c9f70fb5fc9b28/49051094606.pdfIn PDF document text
    • http://2440027.ru/upload/file/bepewafi.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05af52cb3d---58612761174.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8e4c11947ffaa1461c8b76c9b2205e25/vepitanarowuka.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/18160428425.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/xotarijelavutevedoza.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/zamogufagakugumukumuvu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d51c1dffbd---xopunuvoboritekotasajen.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/32880220051.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/af4f4f7b446ae76114adaf8bdfcb687b/tidirem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=best+tv+black+friday+deals+2020+redditPDF 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_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 10952 bytes
SHA-256: abd656fcb943cf7e20bbe0f2b66e4680ca7ea87e243185543f3aa93696b7ed83
font_01_sfnt_off00011880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 17772 bytes
SHA-256: 59f7a67b9b0de168936a39feef6e1a8887f9490c8a79ab94d8d473d17eeced59
font_02_sfnt_off00014760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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