Malicious PDF — malware analysis report

Static analysis result for SHA-256 841cc902c9ce176a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-07 05:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7d1a1f36a49d58ad24f6282a8b336e8 SHA-1: 978fa6a3eb7e741f80fa796bafc9a816bbc0f530 SHA-256: 841cc902c9ce176ac87063c03effc8200ae80a0f5f23ab85b8489b66c5c19e6d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve as redirects to phishing pages or malware download sites, aligning with the 'Spearphishing Attachment' technique.

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://queure.ru/uplcv?utm_term=capitalismo+socialismo+democracia+schumpeter+pdf PDF link annotation
    • http://ekopaczka.pl/imgbrama/files/84845889243.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/degasegewirurufenidimun.pdfIn PDF document text
    • http://midel.me/userfiles/file/guguvese.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160922e675c568---dadaruti.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/4b7a2b1f03b7399c498cd9977418731b/91931411204.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/98534200537.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/43338774571.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/079a1eae5dc31506d7e8e73dc7ee3b36/27603773647.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/giloxarezup.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a760daeea6d---sapetatutubeta.pdfIn PDF document text
    • http://adveotec.com/img/file/juvakoluz.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lq1qiv64lptdgtge17ve4k0373/79447674439.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/rivabozesewanutefapuven.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/588873188.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/33234109097.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/44240533519.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2094e85307---78471294586.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210618_B77FA37AA71DCD4E.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210703202054519.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8e35c80c2a152cf776484ac689ba4941/13070643341.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4965ec16---93370827832.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bae525390d3---rojusalevopajoderimibu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab60b627563---tumekenuwunel.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_off0000b71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71D 10912 bytes
SHA-256: 12df5e815b835a2c7fd3744e0bfc71c5b87f7b55d4532599b660e74e355017b8
font_01_sfnt_off0000d068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 16716 bytes
SHA-256: 844cc3f419410aa02614ef8aa4bf4667fe8b63a49dcccbc39cc77c2289f8d78f

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