Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f6b07c07245133…

MALICIOUS

PDF

60.9 KB Created: 2021-09-06 11:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 581873f82ff0c45098a393c4a931a8ee SHA-1: 9905fb80638c7e623c3342c7bf050532ff89bd24 SHA-256: 85f6b07c072451330dca0b5e77934c7fbe4fc00c094046a543f0fb75d1116b51
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to domains identified as disposable or potentially compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6616

Heuristics 5

  • 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.
  • 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://dxczx.com/ckfinder/userfiles/files/20210814_141111.pdf In PDF document text
    • http://jar-ted.pl/file/musajefidewoko.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/74426249000.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/j9irenlfabh344p1t4qu6phqp5/juvirifufefulibavar.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbe26e1d7---nisezomeworupeborinujefu.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/44504541614.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fec9e5d5736f6d589e9ffa9e4396ff3f/76453968200.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2ca702b0---tijezigerojal.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/11570715365.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/82862876575.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/1698462525.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4bfe484e9---50435118548.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/9637834379.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/zudesijuge.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/xivopaneridi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/20baae83bf8881bb06b15520cabd7f0f/27641429714.pdfIn PDF document text
    • https://petala.gr/userfiles/file/pumodokubo.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/76281238803.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d182d047---31608226404.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/taporiguwukutinivuzefis.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160821d14b6f6d---70741102850.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28692a3431---vipobunisiruwub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=notion+d%27orbitale+atomique+pdfPDF link annotation

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