Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2effb5dff19cbf…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 17:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf0d31256c57d0b05c8872ddeba6cb44 SHA-1: 660feca29f6b7bd5edf56b83351c160467ab5b06 SHA-256: ed2effb5dff19cbf3e0a613d2d8e5735c8b4043754c1d48b0a56c846f0188e3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which are part of link farms or point to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The heuristic firings, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS', strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://huntic.ru/uplcv?utm_term=call+of+duty+mobile+apk+obb+file+download+highly+compressed PDF link annotation
    • http://dkind.net/userData/board/file/29000457197.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/puziwadulusesologiwusojes.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362feae7fb4---sugobeme.pdfIn PDF document text
    • https://dellrein.ru/content/file/xadilad.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/lotifanevuzaxob.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6a55a6e8b---75221937758.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/59114343277.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/fukexiruxu.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/jipided.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161404b08808b2---merefomidu.pdfIn PDF document text
    • https://projetovm.com/uploads/files/93083221365.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/vavixiga.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572e27b3d2---xajufirifatuvekukitoras.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/vumejigaz.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/laditu.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/47982768176.pdfIn PDF document text
    • http://video-cycling.de/files/file/52269470963.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/34663335368.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210919104956164.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/gegunirozojipuwuza.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/taxukavigagefo.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/43824235670.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/88003020636.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/vatewejomirinoxod.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_off0000af1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 11632 bytes
SHA-256: f36a1edf67ffaf7859a326bf30d3e0838c8c628956ca5455bc26d96476afbf92
font_02_sfnt_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 14776 bytes
SHA-256: 4971800c5b5948a5916a1ad427a6122ba6c760affee01f48f3e544c818e12d12

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