Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cea74a45f0135d…

MALICIOUS

PDF

84.7 KB Created: 2021-07-16 13:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7568cbf27ef0672ae634caae78ebd627 SHA-1: c90565aa366c7a9e350a42acebdb8e1e286e5c5f SHA-256: 11cea74a45f0135dc20702011ffc54568fb21e746c19417eab2511ca3aa35802
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jhdljz.com/userfiles/file/1624074576.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4hsfgkfdse66llpmsra9v7oaj3/gafawufiwekasowetusatom.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/j8421p9rqr1jgq0dv24go42eth/54239213259.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/folekufe.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f838e4a39e60f3cc00bafedfc9bab81a/zopigirutiw.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a3e6dd169---84490496993.pdf
    • http://nebo52.ru/uploads/files/17356941149.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/zodexagebaxuxunudiruler.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/4bfc21fc5b5ac45b8ff1197cc37b97fe/22879964751.pdf
    • https://hagepoorter.be/files/files/kazupuzidujowawarolare.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/30cb0ba5bd7b75b113072450cf1e41e4/60098042761.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/9b029aa6f91d78a225301ab4dbbec92a/bunagutafazasesiwewepol.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/39208836370.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c59e18ea---77431356028.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160723a5f77c20---xamurapimafojawonoletemiv.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b58f07060---tuxukojogisezirodomej.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/luvirajusopeditalejo.pdf
    • http://al-bandak.com/userfiles/file/kegurekexoporupovapinusen.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f56a51472bc12cb261cfb58d992cea76/vewupetegufito.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607038a87ef59---kutidub.pdf
    • http://re-view.online/fckFiles/file/ramelobobinufululonakibir.pdf
    • http://africareview.in/userfiles/file/68815533990.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c684f5b7421---fubijawibetat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=train+dog+to+roll+over+video
    • 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_off0000ea2d.bin
b6d16ff1c6ef5ed9cd7be3a54dd7c7c67e22d33adbb89597271443b89aabaa75
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 17152 bytes
font_01_sfnt_off000116ce.bin
aa1481ca14fd60b5e70654b132e384ef5550ec95e49218813402dc9a5f01ca78
pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 10284 bytes
font_02_sfnt_off00012dd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 16792 bytes