Malicious PDF — malware analysis report

Static analysis result for SHA-256 33178f0a092ecdcb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 21:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fca38e68a8c2d21d5f1bd0c7c74f6613 SHA-1: 6e708ce19b4b993c29378f45693f5afe5f1502a2 SHA-256: 33178f0a092ecdcb86e23054eb91538e6d78dd41b4c1625442ecd76f1989bc43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfae950c474---gazefoxunegofanoxeb.pdf In PDF document text
    • https://sukaunited4d.vip/contents/files/wilepured.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/duxixaxadaluwarezefufede.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04bf1f883---wejezejego.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc14ae9e45---90169396434.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/72635277969.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/25677868764.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/51663622561.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/ripaxujapubibepigume.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe06ce637f---sojoteliwu.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/zamabav.pdfIn PDF document text
    • http://kleiberit.ru/files/file/disuwomumezemisosuno.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006aaa85677---mupuduvizipipowimuke.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160edb1c5757b0---ranatagoxegemav.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/81254e0682d8052698a49f4cc73c1b8e/69641876212.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/7567233828.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/jeninetopokedugeme.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02b6b29252---99088719218.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607451fd523bb---dagidafekabawanowova.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/64369445599.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/35018543061.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/dezagidogumisusojopetat.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/jaxitosofakuk.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/9256240018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=clint+eastwood+highest+grossing+moviePDF 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_off0000e481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE481 18500 bytes
SHA-256: 71fbf5bad1ba60775bdd44bc5358bceba1185e16ec9fc5384f64a5af05c689a4
font_01_sfnt_off00011450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 10880 bytes
SHA-256: 205a3041e907a2b089884cd0b6787ddbb689437d03e9cf62c269fe94e9e5ff86
font_02_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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