Malicious PDF — malware analysis report

Static analysis result for SHA-256 22eed96ab1dcc5ee…

MALICIOUS

PDF

72.8 KB Created: 2021-10-11 01:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 876a6293b30220000cafb92984d4fd62 SHA-1: 7c278f8e4ee26c060481cf186acfb4fd9492a452 SHA-256: 22eed96ab1dcc5ee798ca6e605ea818ab75241fdbcb15cee3427ca2ee71e5ebd
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document's structure as a link farm suggests it's designed to lead users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5d92bb8e---90106679247.pdf In PDF document text
    • http://www.halpellet.hu/userfiles/files/48139345547.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16155cfee6b6b9---mogojomapavenajipolowuduj.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b487a5a46a---reripuja.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/lowomowutolibimuresejugir.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/13512960705.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/wekilinopemimirazul.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/75085421390.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/gufowesokewikul.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/jatosov.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/60771748165.pdfIn PDF document text
    • http://cnfglgreat.netsociality.com/upload/files/tolutanuvapewipemekoduz.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/trmmtf0m7fk0nl52kon4t984j1/kijagetavilamadab.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/zalamumikol.pdfIn PDF document text
    • http://hzhuacui.com/images/upload/File/rexesilimuxikoribif.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20211003_010932.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/613b1134cebf17aa34b007bd91b7cd3a/69523944112.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/todukifiseraritemuloro.pdfIn PDF document text
    • http://koddous.com/userfiles/file/12124857391.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/98595087822.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/boxeri.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210903_4E00701A3D87561F.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/vorezavoxekuge.pdfIn PDF document text
    • http://fatename.com/uploads/files/202110052109204192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=phrases+and+idioms+pdfPDF 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_off0000b9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EA 10620 bytes
SHA-256: 9b7a613eb0aaf2c43e5c3ae7a2f55bb89f0868a3d8a5fff9ffb455806215f276
font_01_sfnt_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 16796 bytes
SHA-256: f804c1e5d8512d5093b42e0061d1b973a251a41437e7d256ad208689eac21b51
font_02_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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