Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c93e3330820746…

MALICIOUS

PDF

44.3 KB Created: 2021-10-03 10:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 202aaa4995b8d6c38e7f6680c053d48c SHA-1: b678298d625fd67ba54498a22cc92cc096715c7b SHA-256: 55c93e3330820746157d0b5c7b5c73f70927ea401339a5b287b722563fba0fc9
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lead users to phishing sites or download further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4269

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 http://steelfurniturecn.com/d/files/55401673091.pdf In PDF document text
    • http://ssp.by/var/upload/52606085052.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/fosuna.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/30006568375.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d2e726b97ca94837eadd95932868d6b1/xelutidavemilabowa.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109200406311384.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/56476065290.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/kozatagosolijezas.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613fd2580123d.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/veninem.pdfIn PDF document text
    • http://rsst77.ru/upload/files/10717595205.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4locssk1g7vmvq35pmi5fjg821/81366166404.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/97424796402.pdfIn PDF document text
    • http://www.moyekolodin.com/files/60437339227.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/70838675104.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/98536935663.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210905170838_7f3fw9.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/zezodi.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/10073978681.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/47502460481.pdfIn PDF document text
    • https://fong-cai.com/upload/files/58970807289.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/wibunilamilokurewaxo.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/74473273348.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153bd6d56ed3.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/vezalomutem.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369d18c959e---52648047430.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c27b3486625920c6fba2a6c6d2dee063/24775764379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+counselor+free+online+streamingPDF link annotation

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