Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b6951bb4fd05a1…

MALICIOUS

PDF

64.0 KB Created: 2021-09-15 21:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfe2aae8657e05f03e29d74ff667a0ab SHA-1: 9b2326c14d6551ef44cdfac24d38364faa7f4bc0 SHA-256: 13b6951bb4fd05a131fbfee376e24142e47dc8c55f885735cea24c67f69cea5e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on compromised WordPress sites. The primary goal appears to be directing users to phishing or malicious websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7095

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.
  • 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
  • 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://smidgel.ru/uplcv?utm_term=jordan+wallpapers+for+android
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18c0436bd---kiluw.pdf
    • http://annabarons.lv/files/files/75560048625.pdf
    • http://kapsalonindex.nl/images/uploads/59227393528.pdf
    • http://wellfoto.cz/pictures/files/kumep.pdf
    • http://artechq8.com/beta/uploads/files/nupowebipisojedewedus.pdf
    • http://debsecond.net/UserFiles/File/fugujovuzafofikojozuxuna.pdf
    • http://idealhca.com/admin/images/file/38250607671.pdf
    • http://www.bluefashion.cz/ckfinder/userfiles/files/79684949848.pdf
    • http://hopkim.vn/upload/files/80708700654.pdf
    • http://www.egavilanes.com/ckfinder/userfiles/files/7345391175.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8c3df34c---60832667756.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210904045858.pdf
    • http://tecniagua.es/uploads/ckfinder/files/44064412287.pdf
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/jelulalomasutuji.pdf
    • https://habibitours.com/ckfinder/userfiles/files/nexelenenoliwo.pdf
    • https://responsible-tourism-alliance.com/content_file/files/71203609767.pdf
    • https://wic-net.com/userfiles/file/toxetaw.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc383a57e4---62345397821.pdf
    • http://sahcarpets.com/userfiles/file/29843134065.pdf
    • http://steinemann-ag.ru/33059504272.pdf
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/89583461268.pdf
    • https://shevian.com/images/file/76255045075.pdf
    • https://olamare.com/img/uploaded/file/kefojafaduduzomilujoja.pdf
    • http://metisentry.net/ckfinder/userfiles/files/xegavexolep.pdf
    • https://galedo.cz/www/data/cms_files/files/togez.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbfb.bin
4b8703913ef1e1d4d0af24d8f171cae112388230f9a105c9cda38c780a2882c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFB 17408 bytes

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