Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55e0740fd3822a0…

MALICIOUS

PDF

63.0 KB Created: 2021-06-19 04:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8dab0e22a55e6e9968c8a8eac02d0d7e SHA-1: d7d4701a80125d11ae6dafc9ce14ea256848e594 SHA-256: d55e0740fd3822a073e0ec8711bbf3b110673f7a2e21f3ec218be138c805df29
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is a link farm designed to redirect users. The document body is heavily obfuscated and contains metadata that does not provide clear user-facing content, but the overall structure and URL distribution point to a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://robinio.de/wp-content/plugins/super-forms/uploads/php/files/6vilt10d46leiqnonmqot2ohmv/nelewadesazi.pdf In PDF document text
    • http://sport-jicin.cz/dokumenty/18066027615.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/seludunula.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rutixegumekawelutek.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1498d5ec0ee41601242d4d2b106c1ac3/28673849194.pdfIn PDF document text
    • http://guitarenko.fr/img/files/puzusatamevetozu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/n9sq0v5214l81r933pput1hei5/pakaw.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/zafonajoruzitisaw.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jilejugovises.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab31a71b7c4---vabobixatowebonel.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/42612759228.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/91200620453.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080844d3d4cb---degamew.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0be7799f---makejufubisajaxanolodali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fnaf+puppet+real+lifePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3D 4672 bytes
SHA-256: 1e878566f00c67d16546f9708fa461580bed45b104af34229c6449f922b99df1
font_01_sfnt_off0000cb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB37 10708 bytes
SHA-256: de6f1d2cd7a0ea8ab10489f7630aef80e9128a8ddd06a305342b61b95a915be3

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