Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21fd3b03f704a2a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 15:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 105975f502cd676317d402fec4e7a884 SHA-1: b2bfa49e7afd62947642b46bdd69a7cdaa3e5180 SHA-256: b21fd3b03f704a2aad250c8d021feddbf5d9fee853bf5697ce0d80f75836f582
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support its role as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://ketchas.ru/uplcv?utm_term=formulation+and+evaluation+of+buccal+tablets+pdf PDF link annotation
    • http://sumterhigh89.com/clients/863574/File/gewivume.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rapujomerukadaxal.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/33932465025.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/desawate.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a294d0123---1687992716.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210630075917027.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607053b10c1d3---95226967480.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e84618e630---wewidutunagutikexo.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/98926265477.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fewexinosaxalefipazu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/32385901101.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c34b0c096---kazoxonosip.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/49503378498.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/21990149451.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/bapizebi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/0c1e0c0c6ad2125776f6d106764306ae/87346719596.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/c57ec026019864eaeec16f2a5cec97dc/voponavinesa.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c783dd99f11---44929691605.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/45395884114.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/widotifuvezetapuwadu.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/83367553621.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c977f5465d7c96b8aa9b815d15ea33d9/bitodejuwulaw.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/52595045658.pdfIn PDF document text
    • http://vo23.ru/upload/file/gixekoboxusazidixarowip.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/zezefolijikogemaxi.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/retetajulixarami.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/jfka36qe1npd4rr99f47b8ber4/84083495331.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_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 11064 bytes
SHA-256: d6825f0366fa4f1f7041788f50db8ed635215f1f7b46b51bb84ac9aa1be2ad43
font_02_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 17004 bytes
SHA-256: cf44fb24df0451b440241ec18299cbcd2706bef6ce86eb47be487103261aa584

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