Malicious PDF — malware analysis report

Static analysis result for SHA-256 b407219f13d6493e…

MALICIOUS

PDF

74.9 KB Created: 2021-05-12 21:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6df9dba32755f45af3a4273659faf60 SHA-1: 84a955f8dcf957ed830268f02d1135a73c60515a SHA-256: b407219f13d6493eb7654607c11fdd9370260aed6a8f73bd475b323ffa8474f4
164 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host and distribute malicious files. The presence of a 'download button' heuristic further supports the phishing and malware distribution intent.

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 http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490888400a---71282426825.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/26c9277ee113a1ab146d682e7c098737/veruj.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3e25b2c44---pogines.pdf
    • http://jevades.com/aircraft/fckimages/file/87759919237.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608702ee920c0---43562860628.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/fb55ed14d1810e62561301a23d14f84a/5506245220.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca9a3fd34---wesuzonajakajupetanika.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085c46cecfca---24194896290.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baae1cc98f---bofulofadilomarivogaramim.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/18f78095df67ab53be533a529754c333/gafagovizinikezigexe.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bfff8c6fd---41493211329.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088e2d9087c3---31739197025.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2e2afb8e5b9d4f50028a2c2402190d86/dolowitapowakizukokogika.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160735fa56ef38---52931952623.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb495988a9---sexakufoxag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=islcollective+german+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e841.bin
ff05811b34b50f3c840393164c0068b6d78bbc49c823b27b03be1893acd01c9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 5208 bytes
font_01_sfnt_off0000f9f5.bin
ac46e14d72916c14120812dbeb49a0a546102437e40b3e69089536be580cc6f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 11196 bytes