Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d7fd3c98a8678b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 06:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 640c8d54098546a6768f6c7402f835f2 SHA-1: 278d9974b679b2bc267b1c70b2e87540c4593bf9 SHA-256: 45d7fd3c98a8678b6c227c2b54bd824a6ecc7abe332a598b49041e445c658144
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 detecting it as a phishing trojan. The file contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/uplcv?utm_term=blinded+by+your+grace+piano+pdf PDF link annotation
    • http://cravaluos.com/ckfinder/userfiles/files/dizivixipupanusewoj.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/minopipukalegew.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f3ef97039---famorezabaluponinefudamo.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210522164536.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086276f1e844---maranexemabogupidadakos.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6m8770hqktmk8r6ahilsqe5491/gapafepibemujafulakojosu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc0097b703---daxevigiwonurudupirik.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835dd46dd3a---solovakimirep.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/bofapulagizewuzidakuwuj.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/62025325205.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/c04f5f1de8a175c63303eec275685f38/83680663890.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/zatoroxarodolosexubifene.pdfIn PDF document text
    • http://chromavials.com/d/files/90890987335.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/ripobev.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b8c72a3a---44697979209.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rfg4mpd0blm51bo22u2ma8phfk/38762140533.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd61067b0---46786317177.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/65898748941.pdfIn PDF document text
    • http://dabbleanddesign.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/4009779764.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/r0g8jhkkgsf8i8kva7rvo7slik/wofaz.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae4b577f1---tajupodefevubadane.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/55986342886.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/renunaxokoguredijenota.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_off0000ce96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 20656 bytes
SHA-256: d8567ac74bf616ffcd61e51d68cc28157b82e92f6ac0be8c66a5b7ad5bed6cb9
font_01_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 10936 bytes
SHA-256: ed34ec4ebf6c8f7c72d2fcdc13d0af808c279717a65a600b3ba4b8f31173ddbf

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