Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d59d7ad120027e9…

MALICIOUS

PDF

86.1 KB Created: 2021-07-05 21:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2dddd7377d662481b79176c2f0886c83 SHA-1: bef9c7fa7351ce77aeb584f56e7c4f03ede95a2f SHA-256: 7d59d7ad120027e972742ee4061add09d87b4df12af7fd7ba07d990ffdb7dd04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=austerity+budget+definition PDF link annotation
    • http://christschoolblr.in/userfiles/file/pamurigosixipuvas.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/5632281604.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/d71c27128ec753c9669a2c597c83e927/lubovemapalun.pdfIn PDF document text
    • http://chromoink.com/updates/file/kupasoj.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/zizewijefe.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/pamebunodezokusubipizumuz.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e49b7633e5---sowuwuw.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/f9b559cb0ce17095cc5e94fa8ba9abc9/81842391778.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52fb33cc4---20123491772.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160712e8e643cc---dedem.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16085e666e4b9e---resezoxujogefulaperalep.pdfIn PDF document text
    • http://sooclose.eu/upload/File/53734075546.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5snr0ktr0sti6b0acg1ehaqr86/75295450008.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/dd3fbb89de3332aa56fb578df9f8a3ea/vevuwozatefozaxojepexelej.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/05cead9a9eb1dda7f4396e478b4edb58/47581870800.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1682d67ac---wigokedubakirovafexax.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/4301030100.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/99457038086.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796d4ed66a0---77155632374.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/zopovexesebivuxekomatajek.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/499f076ddd877da8e9d8822fab542449/84634905060.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/pekokuxupilosesekajazajo.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/77240933317.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/96116952742.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_off0000ef1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1C 10656 bytes
SHA-256: 4cb90061e1b9b1b86e25470bde3fd230bc11f4afc6beb183b397d40bbe7bc174
font_01_sfnt_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 16856 bytes
SHA-256: 239831f554cab6d9c2e160054bf65b0974cf2af4c02f8175151aceaf317de461
font_02_sfnt_off00013322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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