Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c93d31311761cbd…

MALICIOUS

PDF

41.4 KB Created: 2021-09-29 13:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 362a22bca6170b08f3807c12b5c1474a SHA-1: 8288b88fc138fa32a7f3def65d2c5dd3bd7b72ac SHA-256: 4c93d31311761cbdab1d784cf49916aca7b8e49ca7581b82165c8a4897fc493a
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The document's structure and heuristics indicate it's designed to deceive users into clicking links that lead to malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8710

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 41 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.
  • 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 http://mtcongnghiepxanh.com/upload/fckimagesfile/rebaroxosavomiwisibor.pdf In PDF document text
    • https://caror.hu/ckfinder/userfiles/files/segunugorukivanabigipeb.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143890bb7309---77070189714.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4526a7a3---85211803321.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d06211f47---46428470180.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/26922226343.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16153b25c62b50---81385094158.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/58870479971.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210903_C54FD3F32832C35F.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/71955196498.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109021051381184.pdfIn PDF document text
    • https://foulardfotografando.it/file/74747217036.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/xalapapagonubiw.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/jilelagigeduviviro.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/raruvejepa.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/lavoko.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b00a41c5f---givevofaga.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/vafixivulatexowogeleb.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/xadalitefezugeroxalamo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/rafukokuluverejuf.pdfIn PDF document text
    • https://semagro-mIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vidmate+download+app+apkPDF link annotation

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