Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd989305d3527b5…

MALICIOUS

PDF

78.3 KB Created: 2021-08-30 16:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f5206129a06aec5e062ccd2b5de0db5 SHA-1: fac2b8ee6174f4ce3889ab8e4db0468cfacf7272 SHA-256: cdd989305d3527b55aa41fde078d0dc9dcc06a6a151b07ec2d0b0a11c03b2c8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://semsaesp.com/ckfinder/userfiles/files/sebag.pdf In PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/59157131239.pdfIn PDF document text
    • https://lordoptika.hu/files/files/29110455209.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/liruvujuxapizebojemosi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/3b6a162c3febcf6f8106922695124373/midakulu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610145c70db87---89330572497.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/67441008523.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/mazasujovufolo.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/77042280207.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ff9qcp0m2ksvisrldugqgf5sf/66222829443.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210716_8F51AE9629555EB2.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/17367969181.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210515233249006.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/linutuseditizigezunil.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/57758277446.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210806010442.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/33832534248.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/namubibalaruwanupoxina.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/18237413541.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0535486a18---fowaso.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/bugowad.pdfIn PDF document text
    • http://indecomavo.pl/inc/32635796905.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4189c56d0e---sogijokojexobevolotuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=to+all+the+boys+2+watch+onlinePDF 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_off0000cc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4B 17780 bytes
SHA-256: acaaea8127f6e1cc15f1d40ebdfafd70ad310123fbfbea4b8db0e08f86d45a1b
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B7 10648 bytes
SHA-256: f6d1bd7387536537bd9da13d7614208620eb82f4e47dadebb02f0ef5150ec6ad