Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc733f06a55cb0a…

MALICIOUS

PDF

90.3 KB Created: 2021-08-04 15:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1fdb53fd149720116d6d81c75de73bb SHA-1: 8b52b324281a0760b1285bcb6509a8cf026fc985 SHA-256: 7bc733f06a55cb0a11562070a7ac6716cd0bd5c91180c6aa470ee1c559d0ae26
96 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised websites, indicating it functions as a link farm. The ML classifier strongly identified this PDF as malicious. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pistant.ru/uplcv?utm_term=tharntype+novel+english+translation+pdf+free+download PDF link annotation
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73f2135a7---95522319113.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd31a5ca2d7---pitenovatupalisosas.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/iimbqhv7sdip6rquuvkrhb7h3m/35701821226.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4ff339cd5---vetilopu.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/sevibiximulinabiripewilo.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c29d1fd8559---7575774239.pdfIn PDF document text
    • http://medi-sen.com/files/files/26784489477.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/24722871515.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e41d1ced4---solavinikibogoniwipukib.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cecb93b599a6c98f5c428d1fba9f88fe/jimezofapilinew.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/15797486780.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3c12e6723---razojifi.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/aa44e30856640bb656db814919fb14c9/wuronokororeweb.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d537ebba1b---guzedozuzamujosurukanat.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/u4on9tkg0t4oekqqsak1m1ju51/93981395668.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/31938735538.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607270c509bc7---ditosimiba.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fc5ff20e0---4622965559.pdfIn PDF document text
    • http://coffee33.ru/archive/file/99401778369.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/satumijaxorala.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/purufakupuzebas.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/jebukupan.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/mubawojigesixelazimuso.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9102b8f64a60d75652e03c37603eaceb/koredifabozen.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_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 17676 bytes
SHA-256: 57b720c7d7577a85d8cbf1d7d15da0e4bc725d40e51c5c166b4d41feeb4107d3
font_01_sfnt_off00012943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12943 11008 bytes
SHA-256: 56ff602d00cc6f9a90a969feb15812ce11f2098de887e88aab5124a4fcfdc8bb
font_02_sfnt_off000142a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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