Malicious PDF — malware analysis report

Static analysis result for SHA-256 6474bcb26fb3453a…

MALICIOUS

PDF

123.3 KB Created: 2021-07-24 05:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a2dfa810ce741157cacf3434465f7546 SHA-1: b6c0c44399286f6f4b8e47d05eaffeaa1cd846c2 SHA-256: 6474bcb26fb3453a01f88bbbc3418f1141e0d3f018c18fefef6c483d7ec5a4b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The presence of a link farm on disposable hosting and the use of compromised CMS upload storage are common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/98baf01e3a120e7f9395ca6b226995e8/resirematuzadujidipe.pdf In PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/hf7qe78jc1t9t35p2agcpvnder/62590743340.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/kidajekemaxabenawonaw.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871432f0059---fugifalukimamasaxonipo.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/45257479825.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/26097219344.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/90975ce5a78217f9e4171660cd0364da/juridiladupurilelo.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/97485720854.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/9g7g8flc6ss8etr085am5c2sqd/46493804308.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/piwotiseto.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/76622912369.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/36747357.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d220d263---mefarulefis.pdfIn PDF document text
    • http://888chji.com/userfiles/files/nivaneremewexepazokew.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6df8b3a74---99116601912.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210702_ABD1332B41A42866.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/36379488629.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae11e1957d9---xebolobakofipose.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf200d5cf3---ropiwuko.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/sirufinuk.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/03740a5ecd2113eb0f217cb8716cb748/91129555304.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/pojiposexajubigit.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/5268305506.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e74c5523---sezefokopome.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/niwefowabem.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7a783d8fe---vipunizurivimuxurovag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=el+plano+cartesiano+fichas+para+imprimirPDF 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_off00017b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B8E 10728 bytes
SHA-256: 772915271b88366ce3f9534d28a9943900908b3e2a18f361b2923fd3fb81ef85
font_01_sfnt_off000193fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193FC 19204 bytes
SHA-256: 35805291bafe4c9a5abf9174a01dc49f4642d928f772c72aa716193b5e73f23e
font_02_sfnt_off0001c4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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