Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5f713a41eca8bd…

MALICIOUS

PDF

84.8 KB Created: 2021-08-20 15:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67ce9ff689927ee58615f8176d3975b8 SHA-1: 746ce07aa6cda9a141030454ff468d2fa9cbd2fc SHA-256: eb5f713a41eca8bd5e28b2e2ef28ad83c4aebb0469d223255970e3598d4cfdb6
172 Risk Score

Malware Insights

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

This PDF sample was flagged by ML and ClamAV as malicious, indicating a phishing or trojan payload. It contains embedded JavaScript and numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to host and distribute malicious files. The presence of a visual download button further supports a phishing lure to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://nomylo.ru/uplcv?utm_term=youversion+bible+software+for+windows+10
    • http://arci-mp.fr/admin/File/bevetadesazalabejo.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450eb9a04e---40596138886.pdf
    • https://mosconi.net/userfiles/file/90064886838.pdf
    • http://dulichgiahy.com/upload/file/gunitigi.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa577770a4---37531822299.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/87uur1qej1t8to8s56e9r8a8n0/68260317321.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8olgq0mu1o82m5lj2vjepk3tc7/gupajujopivu.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ac31cc51619---sosilukegavu.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdfc3a954---dojojelejamisivonuwa.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/35136821407.pdf
    • http://mistral-paints.cz/userfiles/files/zosanovugugovilomuka.pdf
    • https://ikitellirezistans.com/upload/files/navajevukos.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ne9ohqe9pkkcqpb99qpsb6v8l3/49997109039.pdf
    • http://peach2560.xyz/js/ckfinder/userfiles/files/4064074626.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/fezavokipexugope.pdf
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/60164627611.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/e0192b3551t8hrarr7qbg0b7b6/numufefozez.pdf
    • https://alshamiltrading.com/alshamilfiles/file/42218209773.pdf
    • http://kinel-hunter.ru/upfiles/file/28454249191.pdf
    • https://volnynaklad.cz/data/file/kixavigu.pdf
    • http://kaizenlife.com/ckfinder/userfiles/files/gixij.pdf
    • http://magnumprint.ru/upload/files/pavemalivufaxuwoguva.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_off0000e220.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 16792 bytes
font_01_sfnt_off0000fa37.bin
c52dd1c5cd3939651adb55b5679da77f53715892b2815e0817cc7cf787cb0d85
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 10896 bytes
font_02_sfnt_off0001139b.bin
6199208ad8d562185674d9c0398ad3e8b8243e6b680df4f90f93633f038bc200
pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 17780 bytes