Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77b087e24fc1ebf…

MALICIOUS

PDF

93.3 KB Created: 2021-09-04 01:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6850767fa3e665fa328e0f4dcdb43f3d SHA-1: 4aeb925ff3b6eca8905793ce422b2d1fbb09f8a8 SHA-256: e77b087e24fc1ebfaf832ef924e813d3a14d3074fc51b1a8822a6399c1b7e1eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://chcial.ru/uplcv?utm_term=loving+and+forgiving+piano+pdf PDF link annotation
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3ef8018c5cf8a93fc38e4d06d3b4c760/34112245073.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/31518876601.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/wumifigidiros.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/lelobinoga.pdfIn PDF document text
    • http://absigorta.com/E/file/67876163109.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jutowibiwa.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/tikuxag.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/37242727852.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd5dbb56bc---80803819372.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/88951984514.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6a57c8d74df9a5f796fe09feb134fe97/dataledewodenogav.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/gajizaxupividaribotobo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d2bee6f7f---leluvutej.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/18167571261.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/95133368762.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/2371986812.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a4fd438edb7bdf21e81964f5514e0dd4/28005544433.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/wosuvowitepijigobumifexep.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/datixuwumejesoxufo.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/nfn7r118rvfmnq6lp69hmg3vtv/78449454656.pdfIn PDF document text
    • http://ozari-ua.com/files/file/81676828340.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/202563a2924f400000bfe4b77d272afa/65229620768.pdfIn PDF document text
    • https://aashianarealty.com/file/5409826081.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/25259520882.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdd05c55c3---mimeg.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/78329929372.pdfIn 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://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_off000107f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F1 10252 bytes
SHA-256: c3716d484a19fa264b0a3144c35d6147aeb7534617cc246216823b12545e5264
font_01_sfnt_off00011eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EC 18600 bytes
SHA-256: af27e7a759c1d71b564dd0b33fdea4a43f8052b77437064ebc925242d9fc3bc6

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