Malicious PDF — malware analysis report

Static analysis result for SHA-256 8932fe58209d76e0…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 00:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e6815a2621d9ffecb1813ce6476fc9a SHA-1: 7d494c13a0c3fa8d584814392f0116a5121372b9 SHA-256: 8932fe58209d76e006cb519bb8aaeaa38560d73aa2a6771754c539410f7d75be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely as part of a phishing campaign or to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5608c141b681ed18876695ffede7a319/12355936162.pdf In PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/69191424336.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1627424815.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/juxigegukepeluvuw.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/72426144689.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/zulovinokadokobaduv.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/3015449137.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210614_162521.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/hlumj7ihes2p1i5q3n64j4s860/69470454150.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/94799315251.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/89644192253.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/91471541065.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087f101cb2a3---wedarosisabux.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b35f5570d---29873406385.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4540ad1d---93386517049.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2d0cea889e92b4711623599563036b23/88260378694.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/xadopimojukagirumetabu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5k4oavvk5ji82r1plvqda6g07v/fifita.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5bb560d0f---97724456558.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/f1t0rtl7a23hnrvui0ncda4q0u/32015314650.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/jinepavigeranaf.pdfIn PDF document text
    • http://kmsenior.org/file/files/berebugevusi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebe1246994---19820912526.pdfIn PDF document text
    • http://scarpatti.com/files/tekadew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=atresia+bilier+adalah+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_off0000ca42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA42 10492 bytes
SHA-256: 3a18bb0a1d553112bccf08bad9b0da982a9070a33ac2614209369d07b68ecac0
font_01_sfnt_off0000e206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 16552 bytes
SHA-256: 2fbe50790cd1fa1e3bbfe5b1b74792d3f30a1afc8c1bb9c91f26765a94498156

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