Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfe584460a8abd6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 22:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db4224e9aeb87d70f249582490beea9b SHA-1: ddaa1fa96a8719b38f31182b412ab92c6aee4b22 SHA-256: 7dfe584460a8abd622ef9f2837c1b9d0422bd17dd68b639f6c9053908195ccb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/roripi.pdf In PDF document text
    • http://captaincook.hu/userfiles/file/sipofulalevetanexuxuv.pdfIn PDF document text
    • http://effektfilm.de/files/file/90981562010.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/muvadijajerodop.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/8003891841.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/timozeluzivigukiwo.pdfIn PDF document text
    • http://kvrhousing.com/uploads/46287136673.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/zimitofajijazifu.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/36402682096.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/95525475558.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210908185113_610294692.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/kigomejevaporatubadas.pdfIn PDF document text
    • http://benly-carson.com/product/files/rosojajisadisu.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/bijeduwemegojitodezizevo.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbea4a06b9---nojefujamezapa.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/fetudibigepinanu.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/roniravodititaropaje.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/xaxamoke.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///70328295109.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/50267462230.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/10423313695.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134368bf3573---25149060361.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/nidapuxowi.pdfIn PDF document text
    • http://fluorescent-training.com/file/21844708910.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304ce890a1f---75365809563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=contoh+aplikasi+androidPDF 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_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 10480 bytes
SHA-256: 43ac24800c5fef3e6482a550da7d5ca79d5213c968d465f695a4c62154047a4f
font_01_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 16872 bytes
SHA-256: 412dfbf9715c248e8f0fd10d6634f27f4e09ee62107dee97d58486f847c57874
font_02_sfnt_off000126af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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