Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a3796e7c49e38c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 13:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25eccbd83105a4ab8a6113fa059e2418 SHA-1: 59b38426d372144f7f6f792f7df35c6976e14f01 SHA-256: b9a3796e7c49e38cbaafa2cc6fd507534090dffe52d9d67eced88813eb9f88f7
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a browser extension installation lure. The document contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted from this sample, limiting the analysis of its direct execution behavior.

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://logenamerica.com/userfiles/file/42623804750.pdf In PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/08/62341685565.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/kebuzovem.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/savefedo.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/setilozumopata.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/64366771061.pdfIn PDF document text
    • https://eurotig.ro/file/77697537128.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd39e9fce2---lexuwigoxu.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/17973439617.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/8249019331.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/69488396314.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c801c7d975---sekufakaxizopisebuletez.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/lasajenikerisugifinenoxi.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/27942353935.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/9380305754.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/lalijij.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/baletefavu.pdfIn PDF document text
    • http://only-svet.ru/upload/files/sovunefe.pdfIn PDF document text
    • https://trexanh.net/upload/files/bejimerewuxefuredukisapaw.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/sabupumovuru.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/binawepiboni.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/13112350268.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/99ba6e53209c3c803e72ff0d15f426b6/zikutusedugaterusu.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/megijuxoporogapodetidul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+install+chrome+extensions+on+ipadPDF 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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 17624 bytes
SHA-256: 51febd26e350418b83aabf69a8b3d34486a104c62d0a6c86c2b674720736da5a
font_02_sfnt_off000121e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E4 10956 bytes
SHA-256: f44c4f3e8fc675340696230086bd7210369071cb56ec6370dfc9da67fa7baca0

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