Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51be1c4b32f710f…

MALICIOUS

PDF

84.1 KB Created: 2021-10-09 12:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4681594116c31824a571f2752982eb04 SHA-1: 7e4e494a399f31eef1fc4c4b90bfb1f664b99c11 SHA-256: d51be1c4b32f710f3bf6694265e79e74f2a0a30523a4d229f94bb167899fcc5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The presence of external URIs and a link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/uplcv?utm_term=download+hungry+shark+hack PDF link annotation
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161497922c309b---zazokagol.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/mewoji.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/43452453372.pdfIn PDF document text
    • https://halkum.rs/files/78314007877.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/54103921771.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/lisexazagomosizar.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/sawavi.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/42244214029.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f483e4b8ffcad2ca51002e307311dc6b/7261933140.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/23440204137.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/majazola.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/zirefefuvimipiteso.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/56161045271.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/mugolepos.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/dipunorurobuze.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1615a1fdb9e692---87757495319.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/xigibikomakorugirawan.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/93992338792.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/31005288371.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/kuxaturewurixavenu.pdfIn PDF document text
    • 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_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 10720 bytes
SHA-256: a4aa0d28bc1085858edd06cb392377e4790327a3fc00ca088d21dd32923b765f
font_02_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 19612 bytes
SHA-256: 83ceb1b6c20127625753767dcd09709057d3e8bb24720d5b9d1a24a71d453c23