Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b8b5dceb822820…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 07:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a2f62081b0c95f978ff5f8ca9939d51 SHA-1: aceee925bd16e08a2779e2882435897fb7e5beef SHA-256: 27b8b5dceb822820ba46a07ca5505c683c8658b43cf5243bb76d1054bab6ede1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86126108392.pdf In PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/084d62c3fd636a96a2e6aa0808e3803f/4043893117.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9c8c261da4a5bdd357c228a0001cbd34/dafabunas.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/17647593587.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/66006878486.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/23288143607.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/12110716247.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/sadagaludi.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210905_87148867FB0DE4DB.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/91066184744.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/keridisuvutov.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/zazaxe.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbd7e320ff---xuvebubagijogixejuz.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/lugegajaduzanomufidanib.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/topuzevirafogize.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613719f3c8cb3---12097146196.pdfIn PDF document text
    • http://rcmo.ru/upload/files/87869056856.pdfIn PDF document text
    • https://seikai.jp/free_images/files/57300065800.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/30665352485.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/40171955998.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/59394260225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+white+2+ds+romPDF 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_off0000d083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD083 17672 bytes
SHA-256: 394e411027ff280644d2f5af70b88b9816c6e87a07956f2669a1565f2d126a50
font_01_sfnt_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 10604 bytes
SHA-256: 4fe3fdd77ceff82f64b21289ea1f2cda8d627f018ef3d0855a3a6f48ecc72237
font_02_sfnt_off00011621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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