Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bdb014953eb42cc…

MALICIOUS

PDF

91.6 KB Created: 2021-09-19 03:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0ac5a1d796764865b245fbefe251bfdf SHA-1: 1bd3b5380f9c1a4646d4b3022a90d9a32e57236e SHA-256: 4bdb014953eb42cc888e71ab99a116bb289015549ed018a8b27f84fc4cc2561a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://pixomot.ru/uplcv?utm_term=after+2+full+movie+soap2day PDF link annotation
    • http://mnwebdesign.dk/userfiles/file/mowasobojunupopiwegonami.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/kiweragugidudabapiwin.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/27512120343.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/velotanexaso.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/fuligogi.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/91060055749.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/644e44f4eb6e26555d1725a93b3841be/24773261899.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/rudosorizer.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/xexoruzigikazomapis.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/wabej.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/selapeg.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/vivasijugevovigufopa.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/80086490016.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/30957388653.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109021521283428.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/zajufavan.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ab9bbd625fad507aa60e13d114fc3dfd/budamowobulutudav.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/23929519660.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/56347108594.pdfIn PDF document text
    • https://unosms.us/userfiles/file/fonosofekod.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/70026441852.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/72829495707.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/64722792487.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/lematop.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f03d9f3a7---pavan.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_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 10936 bytes
SHA-256: 38053a095594494f968119b34d5bedb44791ff7d824d92bcb0b6132676619a51
font_01_sfnt_off00011c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A3 17228 bytes
SHA-256: 4e6ecbe85584c859088a17af0dbe1657d4717df775a92ff022ea5f99052af11a

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