Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c8515cf1a24089…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 07:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a361a2508803a62bd9cf50b94f8974f SHA-1: 1ea397d50735b88d021a2d12be232b14c2888f17 SHA-256: 18c8515cf1a240897277d69a5ca97b7708cb5dfce1b32d9baf35c2a77fb14764
156 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous PDF links suggests an attempt to direct users to external malicious content, potentially for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://amouage-salon.ru/admin/ckfinder/userfiles/files/2885288250.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946a8ec3f66---gitikowivez.pdf
    • http://stalmost.pl/userfiles/file/38019416618.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71702642050.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f346a9c7ce---popudexijesasod.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e46cc46515---webujekazarafirud.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096854d3e7cc---85456630267.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092d82c2784c---29036192644.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/60365246173.pdf
    • http://chennothinterios.com/uploads/file/85390311956.pdf
    • http://wonikqnc.com/upload/editor/file/1625031862.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9b2a0e45---42163897608.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/kg4ba6vg2pru9q5eig3990r2u7/37080409073.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c72b067b---muruzigomegu.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/sesebakusenovesowamonam.pdf
    • https://rmp-familienanzeigen.de/cms/files/71234366377.pdf
    • http://ducthanhtam.com/uploads/userfiles/file/97307513916.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bq7c9hjli3dim0is7uck630bv1/2649454884.pdf
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/10043843002.pdf
    • https://kopari.hu/files/file/51695594368.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27c03cbc9---rigidabowadokuxoso.pdf
    • http://yusungchart.com/userData/board/file/vilame.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=please+install+sqlite3+package+manually+electron
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e251.bin
417adbbeda749dd0866045a4d6160a03b2279d299dcf25302ddc2ac096c5bbd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 11340 bytes
font_01_sfnt_off0000fcbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 16792 bytes
font_02_sfnt_off000114d1.bin
cba3ce7a9af256491afb688416978c1269b31a435830f7493367a0f6afe86b0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 23392 bytes