Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54f50004486fb14…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 15:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fba1bb1d8b97d98d31951438e2a7ea3f SHA-1: 5bf04945f2fab09fd9e20de20f1f9b80803c78dd SHA-256: b54f50004486fb148b97a8307dc7cc4b8c603bc3fc25458541e634ff4d005f02
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pbhdom.eu/userfiles/file/17190046642.pdf In PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/50864883619.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de52b853a4---lawaditapo.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/gobeduxevomixatu.pdfIn PDF document text
    • https://krusomying.com/data/file/soxobuluzojopofiji.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/7582196262.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/tamijelagokefisado.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210912101717_400304391.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02682cee4---56443901201.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/sutalogebulenogamidexu.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/kudokonawula.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/452304821612ff2f0bb9d4.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/94820166520.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/vifaxekakewabukara.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/xamunuzomapide.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/62507337846.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/75d288658ef8868318b52260884a5f11/rojoketuri.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/5422813022.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/bemepiwowun.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/merubesufisiz.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/28381615774.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/nabavizit.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/ziwagifanu.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/22308252859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+download+cloud+tv+on+firestickPDF 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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10804 bytes
SHA-256: 0b895788e0c76fec95d5ddbe8c9cdcb820e01f0d8706afdd5e221779b44b2df9
font_02_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 17652 bytes
SHA-256: 3d77cc1a25a5c16e233a8d6437300659a884dfea19369e9cff45f4e61f56cd59

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