Malicious PDF — malware analysis report

Static analysis result for SHA-256 6678273a1d5a09ce…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 19:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3cbe7200d78fd36cc2d6aa26d97eede8 SHA-1: fc27bbc94bf517a5b616382069db34bb3b4568cb SHA-256: 6678273a1d5a09ce2c6ce908ebc4a305aea83f48c495e7a455c8021c40eb2ada
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The numerous external URLs, many pointing to compromised WordPress sites, suggest an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=british+indirect+rule+in+west+africa+pdf PDF link annotation
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a2bb60df7---38783577038.pdfIn PDF document text
    • http://kdekdyjak.cz/data/rerezez.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/40615342288.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846321e637e---detodavidovusaxamelodivi.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607735cc406ae---67799862079.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/24838870157.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c581e7f96---79768762868.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/dukibibunukusuxojebora.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/dorepabegotanikimujufe.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/74034212639.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/vukuvub.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/vijomazubutepemutanore.pdfIn PDF document text
    • https://digireg.nz/upload/niwosigowejofufalalop.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/novovubeteradugevotoxol.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809ec942cbd---33997825028.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/39945557097.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/acec0bda56202506ce1bf4990330da70/31552313278.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a10c54caf---14235208251.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c5425d8c7804792e6dd4d3e95aecc814/42502589170.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/31697318283.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/11093956838.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b1fda5dd01504d074cf06deac7dde995/kitosi.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/38505508856.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_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 10836 bytes
SHA-256: 1e0f6deff13e30e1796793cb09e196458ac8fa55d6137e6b1938f23b68a93c7c
font_01_sfnt_off00010c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001248d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248D 17724 bytes
SHA-256: 954039c71db29fdcb06f85443979f9b0b28025e281b13baf800083f7e69625d3

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