Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a711a193cb48371…

MALICIOUS

PDF

92.0 KB Created: 2021-09-16 15:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 640e6e0d61d8a3945c6b8b9ad9fe49c2 SHA-1: a82eddd8055fedb652242831b16c0fe83adf5c02 SHA-256: 5a711a193cb483710cce1ccd4f0c9d9a00101510c860ff8745c155f43e43e5cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious content or further compromise. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krisoc.ru/uplcv?utm_term=hero+academia+season+5+manga PDF link annotation
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613429db629ca---lanejiresofuwolov.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/05b66e77d8a765417f130009f98c0ebb/92543243386.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/28519726767.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/90996560350.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/taxilefetil.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/pewideziwezejopemitotaw.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/rasapelekuzixobugimawura.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/efosbl270cjc1l55ahrfpcpjg2/noguvidija.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/zenige.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/9734017976.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/kutekarasoburivowa.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/zapiwuxomonukobuj.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/7910723149.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zorumopusubemikekak.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///44231460977.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/92613221085.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090817462612.pdfIn PDF document text
    • https://avenue102.com/uploads/file/81903654099.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/72424269714.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/meresuvirexope.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/jipipa.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0140e2d02---naxulavitofigo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613499a596ef7---43674013672.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/34074726634.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_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 10692 bytes
SHA-256: 3112bdbe531d5c77491cc160e330d936144fca56b114db5e22de6ece1493e7f5
font_02_sfnt_off0001270c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270C 22488 bytes
SHA-256: 1a5409ffd0098edf04d67ab4a8de0f1187678e4cc12c285be17feb5d8b08e789

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