Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcf16cb2c680627…

MALICIOUS

PDF

85.8 KB Created: 2021-09-04 11:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00b5c3fb821f3ccabb3c32f86702f3eb SHA-1: 48118d7ee4c8ebd2ca6764ad9e205b81c889e71f SHA-256: bdcf16cb2c680627bf88fb4a34ee1ae38ad679d4ae9ad25fcc71d5b65dabfaf7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though obfuscated, indicates an attempt to execute malicious code, likely to download further payloads or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ipceurope.eu/assets/file/wogulezogetakafu.pdf In PDF document text
    • http://dambi.pl/userfiles/file/lulonoxedafevugasagufa.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/s0d57l6hbq0rg2g9n4f6d885pq/82653517043.pdfIn PDF document text
    • http://skupka54.ru/upload/m/19525961538.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0f2696un34bct6tvd8a1gh5iav/zirasajibilosulokoxazumu.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125f52c09562---tozafigimiwire.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/83587026679.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/33401285555.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/fasitetuzixeruvexigeros.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/89354647054.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/51947177827.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160745fbfb424e---fumukepip.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b83efd2098f---bewasizumalamaginil.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/xonozefuvivu.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16075f18812a4a---fezipotonaxerokune.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/pibadakure.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/4882464133.pdfIn PDF document text
    • https://ubranni.com/uploader/files/suzumijozamutibulelorun.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/gujebodapod.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/sia03p20ceoqhp57dktfkn37cc/28506944359.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/nofulanewevasasadilu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608860d71447a---ditowotivagawu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/df37d5c6f6ef77cc75ce0eece75f2fa2/bitajezodubere.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/nukutopolax.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/22956a6c0fbf5f3ce475fdab3417651b/gewez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=compound+vs+molecule+worksheetPDF 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_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 17744 bytes
SHA-256: 01f5ca58b803e5703279ba24e037a6e1fc8b2600fad3da8d2dea0ba167b4ab4f
font_01_sfnt_off0001180f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180F 10900 bytes
SHA-256: c1fa7c7daf8c00aac4eeafd5ab8a1431a4818e91fa435f31221f398aae12b0f3
font_02_sfnt_off0001312d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1