Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4235d71d378e57…

MALICIOUS

PDF

100.7 KB Created: 2021-08-11 10:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 85ed2c86bb3273e0787ed10dd1655467 SHA-1: f5231cf79d4b3b3241fb182daad895dcbc9c32ea SHA-256: 8c4235d71d378e57788ad33854a4e5b9449dfe8f3232ba5e66cd6bc6fb7a5ec5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external URIs and compromised CMS upload links points to a common tactic for distributing second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9461

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 https://nomylo.ru/uplcv?utm_term=pit+boss+smoker+instructions PDF link annotation
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/903868acea0e642a4ffeda50169ce726/14799595433.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/54957743625.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/85136579227.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202108101131088201.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/wobukiwux.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1na897kga0eotvncukn4ucsts5/68338503373.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/31521000139.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/84254453306.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092345fe81eb---jexejixazeletebexamavex.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/pegevagido.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94fe5acb3f---vexaraxesaxopatufujama.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f4aa970cbd3---70801669078.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/8415e9c562585656a5647d950f46d758/78540703442.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e30f72bd6---45561361944.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/4e6d04a871363e870162218bb605abe9/delipobunot.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/80279827637.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/zuwudejuno.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/pazekugirawobuxivomes.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/movabetevefiros.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/fefodaseji.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/7713975874.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/197393963.pdfIn PDF document text

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