Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f72564b98c92e0…

MALICIOUS

PDF

77.4 KB Created: 2021-09-08 09:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7f0972aedc3011f0bc1d70fbf67c969 SHA-1: 272fcc6f0297434e9ddd6abccf243c0d742f42c2 SHA-256: e3f72564b98c92e07f10b275389ebff528014e23cdaf3f1a321415ae6e83686b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to compromised WordPress sites and other disposable hosting. This indicates the file is designed to act as a link farm, likely to facilitate phishing attacks or distribute further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=physical+education+grade+12+pdf PDF link annotation
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609695e13e7d5---29167976884.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5293275ee48be937ac6ca8508d124d17/mixew.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/57572690253.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/65010913482.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/33826871192.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/fejuxogurife.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607db8af6e395---81360205910.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/ruzanud.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/5555760803.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/lizusegidados.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/lexadatajekibawob.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160abfadabd035---xabasikabaje.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc74b061a3c---477273138.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8502ee2a---46519902651.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/luxiso.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb05c4c26---robeberijudujuval.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c723366ca3---61782233840.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/96b44359db75b9a61372b1efdefd2a5a/28720964531.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/5th0bpdcpvg8bs5itevtskasqm/tinoxa.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/40886415258.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5d8157f0---noroxotexulasuxajel.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/28634678314.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/6860797706.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_off0000c518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 11288 bytes
SHA-256: 74e7e54d9b60fc360ae2dd5f13579a8a5d5675ea13d2831ecdc5a694aba58c01
font_02_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 19120 bytes
SHA-256: a79652bef246b98cf8763b2bd54c8a1c1c729f292eccb73776338ddf5f7c53cd

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