Malicious PDF — malware analysis report

Static analysis result for SHA-256 13174ef054c5900c…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 01:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 831e5641c552c6cd379823dfc19e510f SHA-1: 3aac6a18290e04f71c19621842f4a196492ae6d8 SHA-256: 13174ef054c5900cb489c242881c615ce049a3777486ce10de3d9acc4aa3cc8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs, many pointing to domains that appear to be disposable or compromised, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://trainova.com/userfiles/file/fokezidopererurexozixodi.pdf In PDF document text
    • https://szallas-karpatalja.net/upload/fedofujomafutedekex.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/87625205384.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/xovimososejebefunupil.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/sikajivegodog.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/68322297187.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/natozozadizilozeroganuk.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/muzamejenuzefavizavedi.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/39318228412.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/dafelavazuwevuz.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/ronubikufowelojodomiz.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/44283187929.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/nugari.pdfIn PDF document text
    • http://topp.pl/_topp/file/wunagasiruloserekakanomuw.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f10c7e47b---92584982398.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/15674738378.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/xubibelixupokukit.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/lidijedixume.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d389eb264---43865755243.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/gukezifebuki.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/12708882148.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210903_E69130061EC6A722.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/tetavepefinu.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/gofikikigedamariviwizedun.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614177b8c0e78---62977155942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=html+javascript+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_off0000ea8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8C 10612 bytes
SHA-256: 43c731756a2c612fbb2bdec1b5ca6e18b396b5c06418490e3a94a36af97e2ed6
font_01_sfnt_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 18404 bytes
SHA-256: 2721b5558e497afd2c0e11fd3c9127e072ba0460a4c5784fcdcc2ee7b564907d
font_02_sfnt_off00013288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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