Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd24bd1ac64021e4…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 11:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 754008fb1e88a9b88fdbed0f20021328 SHA-1: 4f9118685005b27250e16e581214a0148a2bcdfc SHA-256: dd24bd1ac64021e435e64395a99e18655680122a08c84acae5f7b6e6b866d9dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://123podkrovie.sk/editor_uploads/files/wonelerixatikuwinegubopub.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6dfd39d5f6---nekidabotewudid.pdf
    • http://maydangson.com/vietkiendo/upload/file/84201916457.pdf
    • https://daquin-ferriere.fr/userfiles/file/83206723964.pdf
    • http://banphimchuot.com/userfiles/file/bijibokajagekoxe.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40cef5593a---mokenamadezepukifamekepa.pdf
    • http://cgl.lu/userfiles/files/bufovuwesejujaneta.pdf
    • http://stilistspb.online/public/files/uploads/files/busavorafeto.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/65881435048.pdf
    • http://www.deco-interieure.com/userfiles/file/82678238329.pdf
    • http://hotelborgodeipoeti.com/userfiles/files/22955068598.pdf
    • http://langeline.com/ckeditor/upload/files/5110663040.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/xerokuwejedetitakusosi.pdf
    • https://anglarill.net/userfiles/file/24456184692.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/a296db156a5e233e98336328643b89ad/sajupen.pdf
    • https://familienbilstrup.dk/userfiles/file/roferanavaminulikukik.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gj7tlj7csi9o9rhgb40lan2ofs/34684115582.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16128def272d66---nabasuvibexo.pdf
    • http://pizzeriadevita.it/userfiles/files/464585873.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d25efe110a099d1f22e78487e0a82b7b/42688003105.pdf
    • http://kadh.kr/bobod/upload/file/2413055159.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609a019f6c742---pafeguvibigarujozusi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=we+took+it+for+granted
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d46f17252c---lajamovopubero.pdf
    • 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_off0000e305.bin
2caf2d76636ac806f7eca5787e967954fa2ff0279d3da8bb8e979333ea3e4d80
pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 17928 bytes
font_01_sfnt_off00011178.bin
b813057dcf47797727d953cebceb6e1b2ca6a08f48ce0a68388431372f63c0e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 10400 bytes
font_02_sfnt_off000128f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 16792 bytes