Malicious PDF — malware analysis report

Static analysis result for SHA-256 b994af978f93da73…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 11:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e2b30e6bfdd4fc85993903be5a0b534a SHA-1: 7f357a4a40e32d2761fc1d35d68a315f293049af SHA-256: b994af978f93da73c19dc4e9bfea68fef1a28afcd969d61d7cee64ea64197ca8
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, characteristic of a link farm designed to obscure the final destination. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://zatoodesign.com/userfiles/files/jufunikolovewujexifaxip.pdf In PDF document text
    • https://iwanbim.com/userfiles/files/64767843950.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/5672395964.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/90000955601.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/zejatonobugamefub.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/wozifatafudopapuma.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/60298424831.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf8c04c16---45987115000.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/melowiseridexupomelazodo.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/43977909989.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/riwejulovuzowujem.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/1060409156.pdfIn PDF document text
    • http://dentali.cz/files/files/11317566833.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/penawilamisunojoz.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n1vs305d2olmi7umjtpp2gha35/fusoziluwu.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/53929151426.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2a1ec60e---rojegefa.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/3970629675.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1978715108613ada6e3bd11.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133978b6aab4---85217085931.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/lavomowo.pdfIn PDF document text
    • http://montesantangelo.it/files/files/35260501719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=starcraft+emulator+androidPDF 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_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 10644 bytes
SHA-256: 6350f3cfece5814569a059c5cbc5a91fb96c2787f79a2fc9c6f7975a89e1a526
font_01_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 17720 bytes
SHA-256: 290f590fcd99436f48361b9c08b1731cf115e81772d6678a7a7d5ab107b90773
font_02_sfnt_off00013667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1