Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4206eef8d9cba82…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 06:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d95d02fa249912e26dca51127346519 SHA-1: 1e733d274df3d8d473abc987e4990dca8a9c8a7c SHA-256: d4206eef8d9cba82fa8d3ed31711434e2759bdbcaae63da47f35b776e531dfbc
156 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mmagame.com/userfiles/file/wumomarivepukewaxidejuk.pdf In PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/nofomap.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6bbfedcaac5cf012a65639bbfff48772/zijamedoxen.pdfIn PDF document text
    • https://la-klamm.org/Files/files/surorixudamivujebemi.pdfIn PDF document text
    • https://ywint.com/ckfinder/userfiles/files/1631999448.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/11813492546.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/poxugirerevofowuniken.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bixisekewu.pdfIn PDF document text
    • http://metall-press.ru/files/94188054112.pdfIn PDF document text
    • http://kechengchem.com/upload/files/zevinijaraxosid.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/66905028524.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/sikemotejaxujosila.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/govubezuwodepofeluk.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/vigerawiw.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/30121528277.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb18df72f---35381711282.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/15914005654.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/5543613414.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/18374621764.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/gurexobofiko.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613244df4735a---22033283170.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/56532953588.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/vifewegivabo.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210907180044223.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/35364542352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=best+lightweight+keyboard+for+androidPDF 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_off0000e5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 11120 bytes
SHA-256: 4f5cf71c4f9299b5782464d20437b7e7ef692e38f43865372aab9dfc5a39378f
font_02_sfnt_off00011784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 18240 bytes
SHA-256: 1fedf0b5ac23c530c6fcd95b6595ceeb7aa2d35d6c94aa9e344abef429708190

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