Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e7c8fd5808244a…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 13:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b653878f77c0a32683321f8ed372fae SHA-1: 1893d8c9d00f422838c5f902d20895e879ac48df SHA-256: 80e7c8fd5808244a0ff89755ca908c3b73fefdc2e341558a4a49178517ca39d9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://takarasushimn.com/userfiles/files/wutotikusumaxuderiduxodol.pdf In PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/12283025426.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/96358390732.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/vqc7hb227vd56bjjaj51g7acbs/14029730755.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/pjtvvo30l2d0i18plmje942su4/87106501397.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/mulanow.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/50096133997.pdfIn PDF document text
    • http://katachizu.com/img/news/files/zekixinukizasetozofiboba.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/balugifuxafasudebujodew.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/f04de7d40a6109abaed5d2ebd5252dd2/49538606487.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/68329212773.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161434ebda0f7c---35420472246.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/31733621291.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/towulusijigasifono.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/64077682494.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/18966879138.pdfIn PDF document text
    • http://wernitznigg.at/files/80588585414.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/93183157653.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/85037340053.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/sixunafemoxabosije.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161443e69ae8b9---46559066851.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/64385096288.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/78342246283.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/vomuvefidezoked.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/86454286950.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/3845924467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=6+streams+boxingPDF 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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 17876 bytes
SHA-256: 8c98946fdfd0ef8fd17b0678886a48368a0036992068116d531684215cc764ac
font_02_sfnt_off00012e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E63 10716 bytes
SHA-256: ffd815aa617b0bf23a9890c95b88610c12b6eb969028166018f14c25910ce3b8

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