Malicious PDF — malware analysis report

Static analysis result for SHA-256 6484591173ca7a65…

MALICIOUS

PDF

77.9 KB Created: 2021-09-15 10:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89c76749d35c1ddeb22a781a4fa7447a SHA-1: 75f2f9fd7c4c758531af0ff6b320eed49629023b SHA-256: 6484591173ca7a65fa98e1d3b9004a9ea12443f3ef8fe23bd049e1591a1cf7e1
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to lure users to external sites. The presence of multiple unknown reputation URLs indicates a high likelihood of malicious intent.

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://nt-module.ru/ckfinder/userfiles/files/bewalolagizab.pdf In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65bd58043---saduzu.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/99212611342.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/fujer.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/27367427563.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/20757969463.pdfIn PDF document text
    • http://samtle.net/ckupload/files/35509433937.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/lojilunuxusujeburejuvuj.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210909_9FA09CFE498640A9.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/vipomibagazudabufizusaku.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/35884616658.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/kuzuzidaku.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/97359828833.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7284d432c---kupolubogimu.pdfIn PDF document text
    • http://zzquansu.cn/d/files/63687964279.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/melobikoxuledit.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sdjehuvdrob5tu7bp7no8806l7/86248119704.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/javopusimanize.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/zikogumun.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/mumumugokuvite.pdfIn PDF document text
    • https://senfina.top/uploads/files/pavoxidawavasovibo.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/remutulimivumapiwivop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+emerald+cheats+gba+emulatorPDF 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_off0000c752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 18908 bytes
SHA-256: af6a53b6cb36c88b35e98bfcaaf6aa682023f6a2b4293465145e728cf4c2801a
font_02_sfnt_off0001106f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106F 11056 bytes
SHA-256: c2d25803986c9a9cd090a09c0fe4ec1468fc5ecfdfa00b9514efc0647a14fc1f