Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81be7d57d3c4411…

MALICIOUS

PDF

89.3 KB Created: 2021-08-08 16:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1094a9a3b53a6eb5dc2e2084f7ac9faa SHA-1: 07b31123a1ca4f1ce7834899afef0ef65d9b94ad SHA-256: b81be7d57d3c441108345c9af1ca04d1a0ef1f7b2d55abfc19df7cbb1a473d82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics reveal the PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, a common technique for distributing malware or phishing lures. No scripts were extracted, but the presence of numerous external links suggests a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://beveragesgs.com/userfiles/file/83763762705.pdf In PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/cgf9gunp3ql1mnhucb3ctomb7t/romowexapakanejuvagefiv.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072462934f02---92791256236.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/visiwexu.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f3f2a7f5baf1672b3fc915f136fb96ff/renunerar.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5c643b9dde9e53a1285b9df2a9a807e3/kefamuzabusozivujofa.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/92015021121.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/86423550695.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/zofunitinikotixog.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/89catdpk6dmsku6tlj2ml5lveu/3272772074.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/9273af84165c054b9861db5336923215/zumozatipoj.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210716044612160501nnz30.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/zorekovovadifipam.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7c8612cffa13229f7b8a0e579d9b14ae/novogevatugaxu.pdfIn PDF document text
    • http://iwishop.hu/file/54207268498.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/63a4cfbb2bf2e7ca1fa888bfeb594861/15868462734.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/77898266614.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d3806277709---80129501347.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160867eb2c81c7---zaxesupuxo.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/65394233744.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad83028e5b4---82774547099.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ed9726d5---74047996315.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/85023904540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=la+belle+et+la+b%C3%AAte+villeneuve+pdfPDF 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_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 10528 bytes
SHA-256: 61da63b86017157b3a2174f608e716aaad58e9d2f85deec819c56ddaa9893d1a
font_01_sfnt_off00010c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 19708 bytes
SHA-256: 2ae758a7b258e8024339e139cae0f47f1b14e0db2f5d5c10df09e0b65a186e6a
font_02_sfnt_off00013d4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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