Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a7404ce6414665…

MALICIOUS

PDF

86.1 KB Created: 2021-07-20 15:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ca968162e18ddb9347a4741c59623cb SHA-1: 11a42a71c52504a505be6ca1b5bd06c18416ffbe SHA-256: a0a7404ce6414665331141f2bc2e994124cc2756f794bfe0d5e1a2f0eff63504
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to potentially malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/75ffeb3eb14da858dad29baf2a8edd57/togenabalevuzex.pdf In PDF document text
    • http://suacona.com/clients/16856/File/56063112379.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/1191c86e619d230913200c78cd9169bc/12088335893.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/29555995068.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210612010356.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/salesadiguwalijamuv.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/mesozisok.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16081346809254---33741209957.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/jexanamumelevegudegida.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b728dadb4e7f4c44eaee8c8db5c3adf5/70700951083.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/2b18d403cbcc0e200527d42346d381b0/ruxawurupusum.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105011837104476.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a8b66a554ec4544a5094096408a873ab/65177042266.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a83e20a3288---50085502022.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c5b9a23c5d14c8e0c8a9237cd05266e/99614487475.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/10453994674.pdfIn PDF document text
    • https://susta.vn/userfiles/file/xovutibubuxuk.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/tebawegufojivuzo.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/zixusozanuremon.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/6225485684.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/55018542350.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16213633232947.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s3rlimkmpiqmjqabfc70pjb7mv/79351435857.pdfIn PDF document text
    • https://susta.vn/userfiles/file/viputaxodimokadaw.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/dapegav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=spanish+catering+near+mePDF 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_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 10728 bytes
SHA-256: 7ce661ab954ae519d2a88e4bad1ed13f6db15f0e64d01104eaa16fa04164ea32
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 16528 bytes
SHA-256: 7a23c76df8e60b380b45de98ab29a4ed1328e92638cda68252b6c0ddada70ff5
font_02_sfnt_off000131cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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