Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c03875968c3816…

MALICIOUS

PDF

79.6 KB Created: 2021-08-16 00:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b02fcf8a591979f4085f9f1a9cc3c418 SHA-1: 6ede30eabcb185754e934c10bef6c89b65662d2c SHA-256: 99c03875968c3816a1357e1c5b140314a673dcb6c7c6a75efffdd4e88f89d020
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is intended to lead users to harmful destinations. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=absorption+costing+and+variable+costing+examples PDF link annotation
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/7gh6o38ec1rekfbf6q99kputn7/gasodifoposovu.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/62729315672.pdfIn PDF document text
    • http://imaginove.eu/data/Files/21793123839.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210523034247.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100e0fdcdee2---89654641002.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/086f2f08d3931307cfaa8f0b0a975f61/46495413205.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/pajusilijaxire.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/537e606ef922701aeebdf4cda81ebd76/48591691640.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/k6v5b56qopksi4s5iaruutnej0/69945763489.pdfIn PDF document text
    • https://quizai.com/uploads/files/23808403661.pdfIn PDF document text
    • https://ovalpolycoats.com/media/xitawatuveladogov.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd37f43f648fc3285f528dc62b08f9c6/burulafazofasuxu.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/8qf6jbqb23gt9gbqf78ncnqc0t/tulagorimejutogu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5380cc8a67---15563174169.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/6cc69cce2f5a111a8fdb64b98db5bfda/mogepujalejogovabol.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf3224e99---diwobodagi.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/84715859762.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/jubumubikofu.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/47f8856b22d4bb1c91cb31a2776dbc45/99463708114.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489e303906---75002189128.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/jaredogalabota.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/93127782173.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/65418654749.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/b61g52aacg7oesg7djqs1om62g/44423449436.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/xerekuwibuwalives.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_off0000d628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD628 11148 bytes
SHA-256: 9a4884131d5cd522e69cbd49cd1089810a86a9e8e0a65a2bf9ce1dcb2b6292cb
font_01_sfnt_off0000efd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD2 15876 bytes
SHA-256: 7b94a4b36b9c55c4b9396977de18104d67a2976b64bb8746b5a571210a8d3167
font_02_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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