Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7e1729317ef746…

MALICIOUS

PDF

100.6 KB Created: 2021-08-10 15:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 485cfc9d8d8156c0f2106035190d18b3 SHA-1: 4e52b7296f605a405995dc3e6578bf8d7ffb0010 SHA-256: bc7e1729317ef7463a372dd381e74b24dab8fd7658d7e79f2d8f78218478d937
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://inwebjor.ru/uplcv?utm_term=exercices+corrig%C3%A9s+des+quadripoles+pdf PDF link annotation
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/pojujofanilote.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080646c54c5f---rarenojazadajewum.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/tisenivomuwewabup.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/vasavavejutagoxusukijot.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/15c1a616070424f43a177605dcc6ac53/17916236345.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081fae6edf62---13460376709.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16094b4768c0b7---95918846911.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a753d140---53161826866.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489c5a28f2---35215695682.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c46e7895e3d---noxuwuzazupa.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/91233686439.pdfIn PDF document text
    • http://patroha.hu/file/poduwed.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7f5c99f636e8c77ba83ed53ee9b77976/64317977267.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67948aabd5---naranegivijemibatoja.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/59979975375.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4763b3ebe9---31480917444.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/jelalizuwakojiguxebat.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01b36f933---nafesazuni.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/cc7bed43d045ac631845a6318f59abea/gavafamajipizunuzofegigi.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2c640ba631ec381f99689e29476953b9/97615065685.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9601036cf3b35e7313aba305adb2d14b/59244285360.pdfIn PDF document text
    • http://heureka-cz.eu/files/31936896069.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/17084825233.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_off00011bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 20936 bytes
SHA-256: ae7a2e20e49e451e5aa642aa2bec64e53ecb2e7d27c72759548130763980ddc3
font_01_sfnt_off00015098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15098 11076 bytes
SHA-256: e093e35c45cf057ef03a90c7080f85ed00d2dd256797ac6a8d7d4e2618a4dc9c
font_02_sfnt_off000169b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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