Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5492d09c61b910a…

MALICIOUS

PDF

93.0 KB Created: 2021-07-01 15:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 91dfd37403fccb3d6292ae8a89c0370d SHA-1: 2f3834f1adea86ea408d12d6415434c71485fa52 SHA-256: e5492d09c61b910a7c94656a0c791e7776910ba4ad7fcf978b2db5e929d1f62f
96 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous URLs pointing to various websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=stars+without+number+revised+pdf PDF link annotation
    • http://wojno-stal.pl/pliki/file/71007430346.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a877c67dc7c---kobewodasuxe.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608228792f27d---12736881698.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b56cc64f7cc---kevinusabigija.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/45173678232.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/6fac352d0f5e3d088f77562591d8bbd2/97586613375.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f6980797f8126f86579b16bbbfcc05db/tivomapuv.pdfIn PDF document text
    • http://aimic.com/userfiles/file/45406344595.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/vutajemeruwepakufijowa.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a4e00a3bda4dfbd560df627510757df8/revexaji.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9023dc32f---97031214979.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/4052086735.pdfIn PDF document text
    • https://ghnservizi.com/file/motowibegufi.pdfIn PDF document text
    • https://nevisnews.com/userfiles/pilujafolajapipipited.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/43045908697.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ac53aefc0757355a1377e5aea31c0ad9/xedowuni.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/daresisowufopebiwub.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcbb1f1156---namixugig.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5e0cbf348---50928316404.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2df0301825dcfa1c1379b474682f6931/63131471442.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/2c7629fde7b0e8d8ef04bfec18909de4/55570031461.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aecbc1bc46---73234418745.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jegijupitidoli.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_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 11184 bytes
SHA-256: f8627beead22201bce07efeb476843bd2e127873cfbd2b1258a4f37f248e3d7a
font_01_sfnt_off00011f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13727 17624 bytes
SHA-256: c7ed134b4930e72a456e2b590e021f094b298b5c3effb1e57bc3ffa388c8fb19

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