Malicious PDF — malware analysis report

Static analysis result for SHA-256 a190aa9d6a31bff2…

MALICIOUS

PDF

39.0 KB Created: 2021-06-22 18:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 21759f408a6a2e9b76e0657057d21cf0 SHA-1: a8b42a881d4f17df99240a0ac9bf55b4613b89ae SHA-256: a190aa9d6a31bff2a5cb6208d03be65801a023af7b11a3aaecccf40897e442b8
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is designed as an image lure, presenting a screenshot to the user with a clickable action. This action directs the user to a compromised WordPress site hosting another PDF, indicating a multi-stage phishing attack. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to exploit vulnerabilities or deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7309

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 38 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fc714c7c5---tatuzikisomujozivuza.pdf In PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/6ab7f4cee679b3f1905913fa84bbc2a6/40868813515.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/mra1tvdostajg7j0tfte86pj03/37906444902.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/zogelulig.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/votisorupodoridewija.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2cf759da896134f5fecd932fb0a5728f/delunanegevekuzukub.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ca44d2402930554da5eb46336b07f591/82399828890.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0af25d1b---gudaz.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/r755kj6ps2a2kprhrr0f74ced9/zemule.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/192887162.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/goxemikesegu.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/wikufuwaziworagiIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=serial+windows+xp+sp3PDF link annotation

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