Malicious PDF — malware analysis report

Static analysis result for SHA-256 471ff67fcba084cc…

MALICIOUS

PDF

90.5 KB Created: 2021-08-01 02:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd142008f15b9b5d735ef397751002f8 SHA-1: 52eee468e17a58e7b348321dd31edf4da5181582 SHA-256: 471ff67fcba084cc1d337d2870182136a1171e0a98a9c56c524d2b6574f36c93
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress installations. The ML classifier strongly indicated maliciousness. The primary function appears to be directing users to potentially malicious content or for SEO spam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://krisoc.ru/uplcv?utm_term=inspirational+scripture+quotes+with+pictures PDF link annotation
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91eb7e748b---nowudinozekofulaxusedapu.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/gomijizufopoto.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9c1bad10---nofodanetuponebor.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0b55f1dbc7072fd10b5132e04470eeb2/besazikitunosizenugar.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/rotunuxu.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/pekudakulusa.pdfIn PDF document text
    • http://slsnn.ru/content/file/5585056171.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/vamedanakoduwudipumew.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/747455528c59864053b7bdfc6b5fdd9e/satanalazunuk.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccc015e3fc---damizepurerebesufizig.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/20484306269.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160abe5839cd35---kirerawod.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86c88964bd---siwuweguzapibus.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/mezifopotiwire.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c75f181f1---62403597516.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/34229230077.pdfIn PDF document text
    • https://combrooncom.com/contents//files/rozadovolixigiwusegabeboj.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e87801732f---18603592803.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/budevokibuvovujedojedi.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/sobij.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/071970f346c4c5fff48c86d2bf1d4c0f/73886079497.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/33788234426.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/78684219721.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_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 16824 bytes
SHA-256: d014ec90557ae06580ba9e0b51e2b506c3589ca1f676151b72ef9dd13ad154ac
font_01_sfnt_off00012b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14350 10756 bytes
SHA-256: 5cbf625c07b77bf9ccf096b151ba83e9d4cdadb282d34783b24fee97fcf2d307

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