Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebae83b4d10a18d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 16:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e24c594956410795a8546b3a4da88f3d SHA-1: 6caa74d1ec2b55a54f79d7a1da003d862fb4500b SHA-256: 4ebae83b4d10a18db66896a4d7a26e822572ce4ac659169cd9239de5d239dc69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external URIs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host malicious links. The presence of these links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b91714bd---26833770379.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d153fe6a---ruzulidowaxas.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/busetoxosuveguminunowid.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be4899cb47---ruludebojonibogenojefa.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/fobugavokilopun.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pekepurajotiriralodab.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/689e30c7d1c0fea74a211d0d01d1cdef/sizev.pdfIn PDF document text
    • http://rld-carbon.ru/file/26673398619.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be08184518---mujizugumubafuwetagew.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/nazojujobunameku.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/ratoxajekasiritedoma.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/43e30e39a164afccccc4a081a039ecbb/gufaniwilujubudiwu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/medadegolatevixuxafum.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/nuxuratewudovetekamijado.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/bulusagekagosiwujaka.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160923831ab78f---23652236651.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/koguzajelevajapugo.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/7509166508.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/14015418260c42c0b0619e.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/12032009689.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607943ca78a69---40821154053.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/97493467846.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///69323860901.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087fdc8dfd69---tujolixezegokinap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cours+hydrocarbures+pdfPDF 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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 10764 bytes
SHA-256: f0f3941daa6ff56969157f61960397d40791a3b67be540d5bb55e7610d383f59
font_01_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 19344 bytes
SHA-256: 753e05db4ad93329ae4169f327d39f090408567546e9380fe0e03df92a3327d9

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