Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b91ccecb5cb153f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 16:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94f66da81f0c3205c82435498f087717 SHA-1: 471bfca9b8cecbebddf293ba34a3cbe4f006e532 SHA-256: 4b91ccecb5cb153f49b5c2c4a77bcf3515a47c098d846663fafbb716201f0544
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm used to redirect users to malicious sites. The PDF structure itself appears to be a lure, with the primary goal being to drive traffic to these external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16129bfef21a80---77155293869.pdf In PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/3i0iq4td7lvlp153dh47rm26bv/metezipisaxowenezeg.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/tikobenilozemazikesugapol.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9e747a793---4919078243.pdfIn PDF document text
    • https://grandegroup.net/files/jewojileseximefo.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/zusanusebigabobevomigelaw.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/juwaw.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609fca10a6e7b---40452660321.pdfIn PDF document text
    • http://blatt-gruen.ch/files/midotipika.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/22106707929.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/gunifujejalukaluvukapum.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/f0561ffd2e6c796310290077936ff63a/67900359754.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/33997389742.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/dh35t7q8ea4hm82nhkvj0v0pm8/fetafe.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/8189249612.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/vitid.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/42214221649.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/99447859566.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1964fc1b79---57669682037.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a81b1d542---68973819508.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/59199346561.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/nurowiwuxuj.pdfIn PDF document text
    • http://home-plast.ru/foto/files/rawodekibowutozozoxives.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=libro+curiosidades+del+mundo+tomo+2+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_off0000bef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF3 11100 bytes
SHA-256: 192a0f8484d7ec2d999a876f0fc1596c5403f5b72e2544d10b886c8b35a1aed3
font_01_sfnt_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 17260 bytes
SHA-256: 845b54d3e84176fdaa6f8395439a93cc1dbbdec79d847a2e36233f27ef8417e9
font_02_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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