Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c558dbdf8c20eb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 18:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 69bf04be3d2d72f0f619433a404fe150 SHA-1: cb44c0e5e13c5bfec6f9af10c5a7dd4aaa91a20c SHA-256: 87c558dbdf8c20ebfa24ed8824f202d5c87145d1aa887310652ddfbdde5df200
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed for SEO manipulation, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=comunidad+escolar+definicion+pdf PDF link annotation
    • http://transportdiverse.com/uploads/files/21192343729.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079cdd34b877---34139035941.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/19244021975.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/21111345371.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/dezawopubuwoxujad.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083966f5511f---90967728147.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/perinajavasazo.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffrq2np82embr93tn578d1b5v4/bopivolobinalo.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/goxinowadenadavelol.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/tekewavowukubenoworeve.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f32673990---85774701186.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/gipatewumeruda.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/pubiti.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/97768deb60d510050be3f64adc0c9a8e/630596927.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/nadokebaganuzetag.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/86617368548.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/sadutedufezipapefuzagukul.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160933f3d11305---diweti.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9e20d4625a9a5431e08bc5bf0545ee0e/74993559295.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c4f45e28d7338426597c9c7016102568/65240478787.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/zolaw.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/medumazuredamonazax.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe8d16176---63626473835.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/26617857282.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162291402280058430604.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c970d5036f1---lavixosatowejisepa.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_off0000c649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC649 10812 bytes
SHA-256: 2a94f64c8c6109bedc522b310e9c751421f8aa6be46c4247363fd5e45c6b5b8d
font_01_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 18200 bytes
SHA-256: 10a649c3a184e92ced369c0e6edd4bf0be1428b802496bf75222dbab09094097

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