Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeceed7f628d76d2…

MALICIOUS

PDF

70.6 KB Created: 2021-09-15 21:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3eed1c53e62c906c13f3985803522d7e SHA-1: 5b49f6addd7eaabcb023dfcdff92a78ac0686a4d SHA-256: eeceed7f628d76d2295cb695ab28868a1d3880bb6c33bc31bfd712499fab61c8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users into downloading malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://speedwayinfo.hu/uploads/file/bivukobalexav.pdf In PDF document text
    • https://stancijanegrin.com/userfiles/file/pirasejanewowusozol.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/5218113066.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/kivevirodafadiwolafi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/580110d4ba496ab9a50c14c739869f74/77072076611.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/11293379720.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/72533302730.pdfIn PDF document text
    • http://cy2hand.com/userfiles/1683461519.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/nokizapesimat.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/3du49pc0ldt8cbd58mbbabh0he/66790040660.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/35961463996.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/xowenidemedineradir.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/widuvafusikukokebefebe.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a21949fe30---60651414295.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/vukutarowefopaso.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/67618695490.pdfIn PDF document text
    • http://elsped.hu/files/file/99870716749.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/97040590509.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/82433600855.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/69612532361.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210911_185846.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/diwekidifabivobep.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/kawonugeridusivedolab.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109050529412155.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/vipurotojiwavakobupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+vice+city+game+download+for+android+ppssppPDF 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_off0000b42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 15008 bytes
SHA-256: d8d169d9d04f38b48c1be9b0900b1976cb1ffe683fe01fd3e8558965505141be
font_02_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 11268 bytes
SHA-256: 46a5ae55df84568d0ca28bdc805e9bf19f1b210baec9ba4bb4590478d6ea3907

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