Malicious PDF — malware analysis report

Static analysis result for SHA-256 5934490ccc1dcf49…

MALICIOUS

PDF

87.9 KB Created: 2021-08-08 23:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 48d6bfaa83a3039edb1b18e1f7bd01c9 SHA-1: 305ad6285dcc45bf3a73b45df911d6f66932f09c SHA-256: 5934490ccc1dcf49b9b79c1a9d2a5aafa1a9bd4965b5ce3fc24b505323859cdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/ca2694261882c963914f08fe82b28c11/zebabevoroxojadosaxezure.pdf In PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b62bb3e1e3---81994847800.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/jezotoxaro.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/57101054147.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a954cf56e---5924769377.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fd618a60---1665716957.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c59fd8030ba---zobulonopakudosatovu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ce6ae288---10314683179.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/xumegevodigiwusonodon.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/xuxizat.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/70578810592.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/27278616814.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/wajok.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2k3c26sb49vi3evjhq4sbntno7/13016412462.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3be76d1c5---lozidobikurifisizefil.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0d24abcc4f319b32b8b68058e23b13ed/61360951597.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7033e158768a61822e158d037938fa11/22069007179.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/bokidejoj.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/19412048831.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/85417210719.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/wojux.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/55587196813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+zodiac+sign+is+the+sun+tarot+cardPDF 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_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 17016 bytes
SHA-256: 1231ada7a792de2a697d304eee6795dba26bb36cf02d78f71dcd75f23746d542
font_01_sfnt_off00011f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6F 10756 bytes
SHA-256: 7deeb3a2d72df7e55af4c86a5c23d1011cf503e5baf6f04289fb2cbd5103d72f
font_02_sfnt_off00013805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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