Malicious PDF — malware analysis report

Static analysis result for SHA-256 e402c35b84183f56…

MALICIOUS

PDF

129.9 KB Created: 2021-06-13 01:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2097067a176edf8d5509169b16f23fd6 SHA-1: 580349b80fbd57966a96957dd2d8ef89e1e7503e SHA-256: e402c35b84183f56205056bc0253dd2639d7dd0e614c500cfd0c59123b8f323b
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=the+human+centipede+tamil+dubbed+movie+download PDF link annotation
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/23d564a88788118d5170f01679b2df6b/xuzere.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160707ac105757---95858938591.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/gdt1blld34dm3ed9j4v4gl29od/nokudosexenivizopozugo.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/10444151328.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/31243774652.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f3ad3386adea61cb6e474806bd2ddfae/nonimenem.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a5de50e8b---giduleloxopiwuzetenili.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/80099914448.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/61inaljltj7v9thr0v422cpf65/43577744137.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/sisufedukopedokimivut.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/5910060810.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/02fe3112811ea5e25540c7a8654b3120/85874901780.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd29a75b0c---luvozexefabumojebuterume.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/48181455556.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/538146513.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB88 5280 bytes
SHA-256: beb321ac6084a7671958b9782eefd3160991c233bd5ea244450883b38dc3e65d
font_01_sfnt_off0001cd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD5F 13940 bytes
SHA-256: 05565f0c2fb84e4833a8a819cb5c844b6397f8c8ef82562fba4fd275524d0ed8