Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec6b154a94d8948…

MALICIOUS

PDF

78.1 KB Created: 2021-08-28 12:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 420418afbf9bc0788a71a80fe1983411 SHA-1: 8f11bb7ace411d11820b5bb98f9493eec8c69021 SHA-256: eec6b154a94d8948ae0e3ce492cb14a0b9532378764fad822167a459fb697389
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external URIs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm or SEO spamming operation. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is heavily obfuscated and unreadable, suggesting it may contain exploit code or be a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://chia4kids.ru/ckfinder/userfiles/files/daxaruj.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c851b1dd55---magazixipim.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/witap.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c66db1f2e---88977572183.pdfIn PDF document text
    • https://maturana.cl/upload/file/vavorofox.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/fitutemudom.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/46749468690.pdfIn PDF document text
    • http://sy-smile.com/upload/files/91901905201.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/gibijevaxalefixipovesej.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/xizakik.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/26941293784.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/lifisododeva.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/muzeleximafafuzafasafoli.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7348a7d2e2bd7226ad09ea7e1902ffbf/89894180089.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/da12b5261faeea5da8b983e313669b5d/rumigoz.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/jigapek.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/49773656047.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/11089937133.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607df64ea29d8---fuzoritake.pdfIn PDF document text
    • http://artattack-concerts.de//files/file/giwetazotovizoxegixetef.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/rafasigobo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b48667ffbf---dofuros.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/goleb.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//90093922612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=book+keeping+and+accountancy+class+12+pdfPDF 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_off0000ce6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6B 11224 bytes
SHA-256: 633a93a8135f68d8d6829d84c8c8e1403ebb5636672b669dc41a43b08356df37
font_01_sfnt_off0000e8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 16116 bytes
SHA-256: 4b65d5a35373e75d3c787feae0d2605c192764312377a4edf8ddc06c6fe0c015

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