Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb241bdd8af924b3…

MALICIOUS

PDF

75.5 KB Created: 2021-09-24 11:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 398c2d857faf966c04dadc40c7edab11 SHA-1: 94e889a3c3e995192502f12153740eb815f1ef63 SHA-256: eb241bdd8af924b3a9a63c6b4999f40caaf437682bdd0be25baa3428f65b9d4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The sample leverages compromised WordPress sites, specifically using form upload vulnerabilities, to host malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130ecb82e2cc---96690533854.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2fd2f09ce---zejadujuxepenegewapu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ace8cbc621c306fc3601b2f12905eeb0/24618414821.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161375a0a3269b---rawuvufilefuxujeg.pdfIn PDF document text
    • http://yibetter.com/data/files/xinekavawopavulifanixaw.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386d8a87d58---105604958.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/menefixosisujikumi.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/84012319754.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/tukezudusexajesopojiliwu.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/mededina.pdfIn PDF document text
    • http://haki.vn/uploads/files/nevanitunavesa.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/kusuvukaregevosizomabix.pdfIn PDF document text
    • http://ontozescentrum.hu/tmp/96909885286.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06a826ddd---wibexej.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/49843289175.pdfIn PDF document text
    • http://www.pvvc.cz/files/lifebenewoxatexedageg.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/xisevonawanuxu.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/14360771702.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145acdb434bf---vasowepire.pdfIn PDF document text
    • https://greenways.at/userfiles/file/6585627277.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/lunumofokezafokebu.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/55452893708.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/gerum.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411e45f2baf---72208576447.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cb7c480854c4f95c3c910113c4f43d4c/47011466938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=law+and+order+svu+season+14+123moviesPDF link annotation
    • 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_off0000c272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC272 17220 bytes
SHA-256: 77049a156885794ef1f28eb87396dd42aa2e0eb8b8ea040811480520cb6a43c8
font_01_sfnt_off0000ef2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2D 10896 bytes
SHA-256: a2b79e34f14e76aa8668d77716faf322970ce18ccb57ec71cec6cc542342ba51
font_02_sfnt_off0001088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1