Malicious PDF — malware analysis report

Static analysis result for SHA-256 25390575e8b345ec…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 00:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5b2e8037525a0e13310a03c03096409 SHA-1: 0b9bd4e322264c0861b1db094cf8fa1f3472d2f4 SHA-256: 25390575e8b345ec3aa3a234fcfcd86847172fde0cc1b82e3de65c253f5b1d36
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous external links suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://coaching-scolaire.net/userfiles/file/96014025072.pdf
    • http://banghetretunhien.com/media/ftp/file/dugonusufuvesigawinax.pdf
    • http://esangsok.com/upfile/files/kemozujemezodawarog.pdf
    • http://bobmeetin.com/media/galleries/files/nodupokupig.pdf
    • https://onutglen.com/caningest/images/file/pozuroxowil.pdf
    • http://wtmongolia.com/materials/file/gomidoweda.pdf
    • https://kurek-rowery.pl/user_pict/file/pubaduvawejejiket.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613311f8e11fd---73946091535.pdf
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/45975004710.pdf
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/woralorozasawedip.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f075842fda---92642207976.pdf
    • https://abcoegypt.com/userfiles/files/lizudifaxovelixolu.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5e8a7c4b9---latuled.pdf
    • https://pmrmhss.com/userfiles/file/36962541859.pdf
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/tefigo.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03e8b1c0a---xofevilufozujen.pdf
    • http://tiramisu-o.com/yamituki-n/uploads/files/90034441656.pdf
    • https://igruppe.no/ckfinder/userfiles/files/1462420810.pdf
    • https://maviet.vn/upload/files/48546882344.pdf
    • https://mumegram.com/userfiles/file/38689808712.pdf
    • http://thuexe7cho.vn/upload/files/3666979778.pdf
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xotizoja.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/774ijeu8p2pljjrbv5vgm03j29/63722993709.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fba1cf5b---mokojetom.pdf
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/ludalupovigepovolapidom.pdf
    • http://6nergy.fr/6nergy/sites/default/user/file/favejefosutafedi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+android+video+making+app
    • 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_off0000e4c8.bin
bce5dc5268f027fd2ab86cec0bf31b349ec9bf3c48b3b7f7a7c709915a4466c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 10900 bytes
font_01_sfnt_off0000fddc.bin
31ee4c24c990e482e41ca9f01f80cddb09eaba301cec56afeb6286ed8d16e421
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 16732 bytes
font_02_sfnt_off0001293f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1293F 16792 bytes