Malicious PDF — malware analysis report

Static analysis result for SHA-256 de35d65739b575a6…

MALICIOUS

PDF

171.2 KB Created: 2021-05-27 13:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 622a8a6ec0f601f783c783c655d96c12 SHA-1: e16882b84665076eefe56b0300f80087d2f7c30b SHA-256: de35d65739b575a660b199b0443a8837528620ef17e9c6ac3bacabcd78ef2e7e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware or facilitate phishing. The presence of external URIs and the nature of the heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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://wastran.ru/uplcv?utm_term=pearson+education+5th+grade+math+workbook+answers PDF link annotation
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b38104701e---zisoweritexi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608d78f6aca70---motaluxobufijopafu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f6361507e4990c4b577130981c2d4c8c/ririg.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/uualkhdttej869fs4vkef7nk4v/meperiguguzawalesuwamopev.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/46333921277.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/r8v2ncat8q8frgln40ic2dre4g/fejumagoluxifawodojatod.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa68b2a9229---86934128453.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6c1d88ca3---xapisimirafo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f4cd91556---96599321498.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/07c5f359fffd085aa25477662be9f567/23939147957.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/fivolug.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/towix.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/fa7793934d6a25476af10df096fc2eec/towus.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ppee14jjq9ld9qj4t5727qmn55/mokipojeziragibururubo.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608163f78c7b1---sagikejajoribujudi.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/kimowepi.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/zosupakemix.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/138c0c0b970b29895a053770ebef876b/37735333116.pdfIn PDF document text

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