Malicious PDF — malware analysis report

Static analysis result for SHA-256 2168b3c9b4e065fe…

MALICIOUS

PDF

93.2 KB Created: 2021-07-16 03:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44f4bfcd808fb003bfb3be7270455622 SHA-1: 676d2355f0c69f5543b924a77ee0bb0a552b0663 SHA-256: 2168b3c9b4e065fedf54878755c1cfb68ff8cff2d5b1225693d4c4e8b4f3a413
196 Risk Score

Malware Insights

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

The PDF document contains a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1b8231700f3b96660ee5f9f717a09b70/melemawevi.pdf In PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/kixadulimulivanowif.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ntad790463t4u6d6n4lmg23obk/36661290998.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/90541190657.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/20911773195.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/sazigafewarej.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadcc17df75---57282793424.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae49af37138---41392696265.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/keworifaxogototuduvaxo.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/10033295310.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/bufujezisonexej.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c9a445867667ed799f7c950c1e5c2ddd/riwanajuw.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/27815658513.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/60328048942.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/tidodumigukupi.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/24855416431.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/57kshpr647csraemvs6th4k6sm/91506233840.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/5536431363.pdfIn PDF document text
    • https://33mobility.net/uploads/files/senopanog.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c8b95255---77670025761.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e935f5a524b---vagobavag.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/211c1830e2a109b4cf85128572e8c090/11687270873.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/72f4fe1eced30cebfbd6f41dbf3de46a/48649072292.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/bokituzafomibukevadog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+test+the+web+application+manuallyPDF 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_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 17900 bytes
SHA-256: 7bc9c4b839c7bb19b75a393e9fbf7fd618301f7a0e28e8bd179bbccf89f3ecdf
font_02_sfnt_off00014c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C78 10968 bytes
SHA-256: 0fb141066ec49b34bd68593746da616483a79a3b3f02a8187080da8c735e5287

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