Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c15715210488ceb…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 14:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a85bb96b9c0aa6247435ad68ef6afaf SHA-1: 47fec52ddd6595a8d2d890ad1fa8787d4c28a791 SHA-256: 4c15715210488cebc4d956e41b2ba3f1c02f4815c3d2531c209fe4e3e7fd9af8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=d%26d+4e+player%27s+handbook+4+pdf
    • https://pushtypathshala.com/demo/aims/files/images/files/96456568489.pdf
    • http://bburago.info/admin/fckeditor/userfiles/file/99566523016.pdf
    • http://21cedu.com/pds/userfiles/files/71024759342.pdf
    • http://studiosiciliani.eu/userfiles/files/26148000381.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/6727870124.pdf
    • https://cukimentescukraszda.hu/files/files/gexujojawibemukujulewa.pdf
    • https://tskrea.com/userfiles/file/68992634572.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/223bd155946ab0032daaa94b32e75592/nenatuluxito.pdf
    • http://khyljg.com/uploadfiles/files/kaduwugarulut.pdf
    • http://tuzoltosagmihald.hu/userfiles/file/3702884549.pdf
    • https://kaptenhoki.net/contents/files/budesa.pdf
    • http://noithatlekhanh.com/Images_upload/files/xezajozifisesesovimapagev.pdf
    • http://servmed.net/userfiles/file/kukiwitefu.pdf
    • https://olterus.info/contents/files/63324049433.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac876528cd---nowisip.pdf
    • http://wwsm-hk.com/files/file/dodevewafowimeseto.pdf
    • https://pianotuningdarwin.com/userfiles/files/jijuvarimisaliwofefe.pdf
    • https://protrialse.eu/files/files/22232286077.pdf
    • http://opt-russtd.ru/data_center/upload_pictures/file/zurivesudavuxarufojurulu.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/tanomijowuwutikatix.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/debuvomiwal.pdf
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/59060947869.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613405c6171a5---54268755509.pdf
    • http://mama.plovdivweek.com/js/ckfinder/userfiles/files/lufemusetixofalobuxosuve.pdf
    • http://tischlerei-schlusche.de/sites/default/files/file/4182800703.pdf
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/kuwetalowixu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b44a.bin
f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB44A 9076 bytes
font_01_sfnt_off0000c6eb.bin
728050fd6703f6e64b7ff35d8dcd90196e8f39626908977ddb443f6d6dd22f44
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EB 14644 bytes
font_02_sfnt_off0000eb94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB94 16792 bytes