Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb3451bdfe642e1…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 18:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4336cff999dc16610f4431eb8e4dbc08 SHA-1: ea68a7ad3895b7a8b0d91af3fbdc578f0d25b39c SHA-256: 4eb3451bdfe642e118a005330bd824623562569321e0060d69663aa1b3c423b3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of multiple external URIs and link farm heuristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://tenutaedone.com/filesUploads/file/73971313496.pdf In PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/pivusovojabixoku.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/070712225247.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4c0dca99b---toxosemesuzotudizirepu.pdfIn PDF document text
    • http://nscenter.cn/upload/files/salefasejos.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/dawevojuzikugozik.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c08f31c5d5d---xesufuganimidelaberobu.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/87781461664.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210706080945.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/zinamumalowato.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160746d8ee0776---53761623259.pdfIn PDF document text
    • http://rideco.hu/upload/file/jexatepux.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/98002218816.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/85627908215.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/krcgnc8ddecrotguco3rquudb0/93853296934.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/86726485932.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/551af87e65d19f91748122617e488758/9350939586.pdfIn PDF document text
    • http://4bx.pl/public/file/wogidozojo.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/kilemikoboma.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb713f49a1e---xavelokogu.pdfIn PDF document text
    • https://advik.net/userfiles/file/64955544687.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/4325660473.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90896e5e80---14937308098.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c0d29554f---wotokufikelipojenigogopit.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329fc16736c---57192839606.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/43299896837.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c8368da6c---xedevizekoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=lord+of+the+flies+pdf+archivePDF 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_off0000dd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9A 17760 bytes
SHA-256: 6b46f611b7fef12b9fa98fc3d804e323363e88b4e39e83f390fd49096f0a6112
font_01_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 10636 bytes
SHA-256: e81808e5fbadcfd61839f0d161b491249351d20e7eecb049a9148eed4ea84115
font_02_sfnt_off000124c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1