Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d21c9b6688b611…

MALICIOUS

PDF

76.1 KB Created: 2021-06-11 07:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c05cee8b87544a6248d3f7be7e948c20 SHA-1: 70b4d319eab524c5cd37bd2a5591f5412880556e SHA-256: 76d21c9b6688b6112f66c8cb3fd085d9cdb51523cee4c6c160d93ae3ad4a7da8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste content into a command-line interface, a common technique for executing downloaded payloads. The presence of multiple external URLs, some hosted on compromised WordPress sites, further supports the download and execution attack pattern. No scripts were extracted, but the overall behavior points to a downloader or dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://garglob.ru/uplcv?utm_term=windows+10+activator+txt+64+bit
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6169c8e0d---95180082880.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-3/20210503183624356429.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7713ae6d63b0a73b8cb6dcc538f6a6e6/92133561355.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b73c6982cad---81261314676.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dd3f3ffa1---84658748112.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160994fb76b70f---xevofujawukojajese.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/677e64db6bf080a684126731143fd9b3/18546240393.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9b6cbeee---tiwoledulini.pdf
    • http://best-infosystems.com/userfiles/file/44217211946.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/5eb05ad359b18c2eff0718d2df1ad125/67408024453.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ole32d9u1hrv72mnkqg2p3hloq/55052135792.pdf
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guxaduzojerarafuxuwaxaw.pdf
    • http://www.hangmandigital.com/files/file/fanonivowazepebuzej.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd78504f4---niruzefa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://get.msguides.com/windows-10-8.1-8-7.txthttps://get.msguides.c
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e807.bin
ad0b7e91a45d98ab81de8563b4d9b628cedb406fb74aa760fcf97d2d573a59b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 5708 bytes
font_01_sfnt_off0000fbac.bin
a31bf08fb23dd0295e3a8197dc674e88498e65ae83229959295ea5ec8373449d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 11640 bytes

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