Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4e96cc7e352869…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 13:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a972fa3dd69c669e3523fc53328ab89c SHA-1: df585e43874c5e15f82439db3a8bf8585b4d4074 SHA-256: 3b4e96cc7e352869df4522ff163b8cf9bae5fcb76018f5304aef5d71f249dbe1
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts social engineering to prompt the user to install a browser extension or update. Several URLs were extracted, some pointing to compromised CMS upload storage, which could be used to host malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://eqsport.nl/userfiles/file/9931376751.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/1ab6d15526d228ef9e1ee156af1dce90/vafegoziw.pdf
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/malopasumofusibiwataduzuj.pdf
    • http://caratow.eu/userfiles/file/fosuwugajozubamuvinibop.pdf
    • https://agrimal.pl/userfiles/file/71475426604.pdf
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/ruvalupatezuzabux.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/86824026860.pdf
    • http://kleinschaden-expert.de/userfiles/file/pabedutulagasoloman.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/27082708248.pdf
    • http://hanhthien.net/uploads/file/54731582263.pdf
    • https://laser123.com/geektic/files/jupefonewi.pdf
    • http://fatamorgana.fr/uploads/assets/file/27321522470.pdf
    • https://larioenergy.net/uploads/file/munuvuronorusudafokuremav.pdf
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/nixinuzamubo.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538d1958fda---miwafasirotozagijoziw.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/bifasamadasonebixofedadaf.pdf
    • http://x04ydivan.ru/userfiles/file/pugefig.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/60541322844.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/crn9rg8tqcqq1a2v6r0a0ao61l/vitaxadojojutupusemaf.pdf
    • http://hrzservices.com/uploadfiles/file/1055415985.pdf
    • https://horizontire.com/userfiles/file/97618376440.pdf
    • http://ahjygjg.com/upload_fck/file/2021-9-22/20210922230025430320.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16134cc87c713d---60743361091.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/jixuzofanamaziju.pdf
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/62119164665.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=spooks+season+1
    • 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_off0000b3e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E3 16792 bytes
font_01_sfnt_off0000cbfa.bin
a90a6cd7b2dc67eadfe78bf404795b49517158ed689341fb4248983e708dcbe8
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 10128 bytes
font_02_sfnt_off0000e2bf.bin
8f23d79b3bb9926ff09e5bf82ccb5f34b67d53f77a0d575bce4038f7caab12f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 14620 bytes