Malicious PDF — malware analysis report

Static analysis result for SHA-256 4262fdf0b2f18bd1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 04:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14824f6abf2b34d33cdcd367e239aa4b SHA-1: 6c07a4c5d3f4ac9953dfb5a4656c285c3bbf5e36 SHA-256: 4262fdf0b2f18bd178b78e50a6e467b0fd21cb41d6da3960efa7bdc25271fd34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/uplcv?utm_term=weight+loss+measurement+chart+pdf PDF link annotation
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/67ntibngufuvg48i68kgpf9ti8/73969415688.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/ee85dda2d1b824a0c341681908fc5e73/nokebikaj.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/86979494322.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/25312485702.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce83816243---luwazebupa.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/55027673746.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/82168927812.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/e93485c122bc31f9e994beb1c8a932b7/86017632585.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611bee5b6c714---kileduzubodewebi.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/436c0a9ec7cc87d0fd4e16b1aab3ca02/91125664714.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/df9927419ed15048ef8877e0a7b5ce23/36199316792.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/xoburelegiri.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d518fb2e94e6f4db2c6bf7686038e9f3/3481354490.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6f190367f5a4190d90f47e8cd4ec3c63/xowovawisivumepujufivu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6a2bd17d---73271326387.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/2059201280.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/10479276569.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/75536154777.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0432f44c---tizilosadalute.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f35d0f918effe6b4060b7250eed74857/wuxivizopunijez.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6d52dbd2d---firemekatelajotelevemag.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/genovesagovoli.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/jujuxubiz.pdfIn PDF document text
    • http://candientuvibra.com/images/file/56271173080.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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 16692 bytes
SHA-256: e5537c1cc7f258447da28994679d7ec72e32dd6da4a09416a6bedd19f1ec68e7
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 11160 bytes
SHA-256: 95660f4a203c6367eca20b1b574817c93cf09102dea8ce21eaf9d65b21ffdd9c
font_02_sfnt_off00011bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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