Malicious PDF — malware analysis report

Static analysis result for SHA-256 30dc88c58dce4c66…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 14:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d326560379e65abb4dd4233f85236af6 SHA-1: 360b00f29a9c5c5d10914655df474f5d8dbcc542 SHA-256: 30dc88c58dce4c669c213578405298decb1801f6c2a9dcbe147abddd632c15a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nomylo.ru/uplcv?utm_term=french+canadian+split+pea+soup PDF link annotation
    • https://retake.dk/ckfinder/userfiles/files/36927502886.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/bd87d676169ba0bc63ba6c19315362b4/kobuz.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf1af55e8e---tomavabu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d406a9feced44c80e650ac01e6259b3f/dusazes.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/piwozolavesi.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/55383072845.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908c727b725---rulowapezabudasudepa.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/kukon.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/76534858351.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vutajunevod.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56d5daefc---76790312692.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/21786427839.pdfIn PDF document text
    • http://kokalietudarbnica.lv/files/files/2757098132.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/19736995933.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bace09b7465---vagujapi.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5197c2b137---mivuxenojetumapi.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/70241963658.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/27804212463.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983961ecb82---kuxusabigo.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/mafoxivusoravazexugafasa.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160844b6412a56---wotabek.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/74621684906.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/57212822376.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ba01c8727dfdd3f024ac6a19ac9781a6/93559059878.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/66691273430.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_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 10688 bytes
SHA-256: 2f292b504b6cf72f56dd4f3e9404e3fae05a944303d12f5c864a3d07c198bd0b
font_01_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 17364 bytes
SHA-256: 7f989cf7de3eebcdaeb4234c007ea9f90d2ffb730284a9b004a1720842da2e71
font_02_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1