Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fa46b911cfc282…

MALICIOUS

PDF

100.5 KB Created: 2021-06-25 23:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58ec51ed46ec533cdfb222779c3cad07 SHA-1: 1a48c36d79859020ba5b7129155c2fa56b33b9ba SHA-256: d9fa46b911cfc282c1e4b0c4ee5475bab396935b3e42de84eb124538274fc229
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, likely functioning as a link farm. It contains numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/gedifufuxowizabipasudu.pdf In PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a928b11d3---91905021281.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/tidaxi.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e463ef74697bf8d5286c51133406721c/rasizemubavu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a858078c---69789187139.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/keloxasalo.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/jawezubo.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/53502493726.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/50cdd4c929e64c4f7f20445c0d97bfd4/kasefotosuzexiguvabu.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/musugafaxoku.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b462f931c7e---bivegokus.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/86baa30d3fc6d1888b0f5eb2cd1d2451/pudaxabo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9cec75bcd---4129990883.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/adrpq9q14vmihr3v26l49suom5/gebenikipowojifafinemebej.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/17577116371.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c84bee062---25398225065.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a981c06a6---lukevitine.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082eeb638fae---2931647852.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ec7dad08e23f495bd63d536cdcd107ba/xagiwufizewimemoja.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/dinewibawekel.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c634c9a2ab---pagezop.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/4bmllp6nbs4pi1v4r8didm52o7/94287727578.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-10/20210510125254937186.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-26/20210626025130455830.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/3617826e307be62a8dc7fa963a0ecdf0/33314116608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=scorched+treasure+scratchcardPDF 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_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 10400 bytes
SHA-256: 454e4e8e39a3b2f346f42e934591ae535c8729e497cdd228dd9f5a0ca2742330
font_01_sfnt_off000137d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D4 20764 bytes
SHA-256: afa5de98ab27aa6497430ee6929f620bc0c08a166fceaa83b3e245db00c1eef6
font_02_sfnt_off00016ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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