Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f247f89af41e63…

MALICIOUS

PDF

102.1 KB Created: 2021-06-12 12:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 1bb42fbb4793167cf66f375bb2332773 SHA-1: 50fa33ee78a90f8c6f805f312cda76dd3b0035d0 SHA-256: 78f247f89af41e6359ecb97fafd2bbaebbbf9077a4d7ee8273393f172ffa4516
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://smidgel.ru/uplcv?utm_term=how+to+get+expert+staff+ghosts+in+mario+kart+wii PDF link annotation
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08b6c7191---42091199717.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/vunawexifofiriw.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/q7fv527n4iak3e2ph0ic7ppsc2/webebilukep.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2563884e8---11796403855.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16080c109a008c---niwuw.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/dbd0202b71d4d6da09222f0fde903bfc/52655280042.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f7d5e04f---19732024494.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc63c3588---83450946628.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080507b68305---23756459588.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d90d178f28---43445045974.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/fobawagapevekoto.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c716996511---58130937357.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/gularudifa.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/fhtvaaac19ah2id6ng20lq343u/82459326087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13907 5948 bytes
SHA-256: 71cd7945eae926cbd3e0a5c78e280670c4c0e89816a6da67ecd2a0388d4e0934
font_01_sfnt_off00014d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6C 5468 bytes
SHA-256: 8845f31bd37e8996fae76134bdf05baff151fbdb8ec88b932ee27b8e7e61e1a1
font_02_sfnt_off00015ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF9 13416 bytes
SHA-256: 5d32084cd6df9bab4609711914bed1e3a013cf70744a45d9f1c824fd980f531f

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