Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9a6a1c06627194…

MALICIOUS

PDF

67.8 KB Created: 2021-08-17 21:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46f1d27417ba54fc58b1fcd36adcc39f SHA-1: cb23554e66228c8d94f0117c22f0b79596b7b2ff SHA-256: 0e9a6a1c06627194da26e803301fd345d4b8487307d334afcb0ddbf9aef1d0ca
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9558

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://newchat.xyz/js/ckfinder/userfiles/files/61864429766.pdf In PDF document text
    • http://sjar-tech.com/uploadfile/file///2021081210551446.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/biwivara.pdfIn PDF document text
    • http://jarosi.hu/files/file/vexokanomenu.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/tujupitofi.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/e6f5deuj43p3mb3qs562hu4im8/31182263057.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/18512808557.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/197a6a5f8dc4fca15f9365abe1ba4c79/begetorogopopelubotudel.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ede9526f9e3---buxabefefezipuroti.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/51496144843.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743597c91d5---75050758459.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210815_045520.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/45005378341.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1f89bcf46041de031463518610f45543/dinagowi.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/17912838860.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d48900d13cb---rolerizivi.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rosiwinajaz.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098295430375---navelop.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d17856648f2e449ea21f041ee483e341/nilufanavu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16073c5a0abe45---71274472893.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/9273315147.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20ef16e963---wisazateba.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88a4ec4c30---wonokotasewuxux.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7528fde34d6bdbde8691ea02cf44f918/valoxidovubep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=biology+osmosis+worksheet+answer+key+pdfPDF link annotation

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