Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e31ec2a6d5ee254…

MALICIOUS

PDF

73.6 KB Created: 2021-08-02 13:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 957045e774f7689cbc3334a74cf4034c SHA-1: f8e67a648a50385dc18c0f0b4efc85bde9129f5c SHA-256: 4e31ec2a6d5ee254e50bc44b23de46128169659aca9561085ff083ddb8177ed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, specifically within form upload directories, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the nature of the hosting point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b6a64135---94861401019.pdf In PDF document text
    • http://fipjp.com/userfiles/file/genamav.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786a873af9d---gudukuxejejemewe.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/33856256091.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/75027a2bad888e233e55c7631a710327/piziveramapiv.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/sisov.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/18c789dc41fc8a24f13b5d408a6d2f10/91526773971.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c82dea995e53644c525617c67574ddc4/28853623452.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/31211161210.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/591e6a9f2b9ce8bff437ef18168a95b4/sapagotuvixejagajugaj.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/35a49bdf8dd95aa80042e08234524385/59995403272.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/detiwikukifawukexokopit.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b6cad27b7---pasobatifukug.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210715170612-wevevefelapi.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/dedovafinafid.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/if2l62lje74mr780us7cuu7hb7/48822467781.pdfIn PDF document text
    • http://sport-way.ru/img/file/zagubizitaw.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bf4fc46b8---nogexasirowibitibanozu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b28892c12c2---26931367105.pdfIn PDF document text
    • https://fotovipvercelli.it/file/kawisolovekiwojerosufa.pdfIn PDF document text
    • http://martonelektro.hu/files/file/425581179.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160982e7687379---mawuwebogagavamu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161057055831f4---wovafus.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210729212229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=baaghi+film+full+movie+bhojpuriPDF 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_off0000befb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFB 10924 bytes
SHA-256: 77616a8ef1cdc53bdc39df290e2d30d203f7254aca70b6f64028a1989abe0adf
font_01_sfnt_off0000d7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 15448 bytes
SHA-256: 140040270f999f7ae0a856c4d48cf0117dfb78c972bdeaca4de6257be2a7c426
font_02_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1