Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10a0cee8e661636…

MALICIOUS

PDF

41.6 KB Created: 2021-10-05 19:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: acf4acecc7ca53abf9886f0604f166f7 SHA-1: fe3707e67a37945cee675d19597c5a1e23236ec2 SHA-256: a10a0cee8e66163689879ac3b1a1f28446ed9fd2f90e5564b154174764d63660
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. The 'PDF_IMAGE_LURE' heuristic indicates it uses a full-page screenshot to hide a clickable action, likely directing users to one of the numerous embedded URLs. These URLs point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a campaign to distribute malicious content or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7020

Heuristics 6

  • 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.
  • 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://thermaltrailrace.com/imagini_ws/55889757357.pdf In PDF document text
    • http://qiuyutv.com/userfiles/files/20210930094936.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/24055375068.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/71118379360.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/73126592612.pdfIn PDF document text
    • https://ikra-ekb.ru/files/fckeditor/file/In PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/guwaxus.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/02/kepelovakokotezosavoga.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/xugikifozemusagi.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/20975560272.pdfIn PDF document text
    • https://thehealerspoint.in/admin/userfiles/file/25355243707.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/63778884188.pdfIn PDF document text
    • http://fpole.ru/sadm_files/62897913377.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3dc21821fcb21d47824e6d0df0cb56bc/tisewanumurofidulejezema.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95d37bf8a---jaxutazev.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/85301633750.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/tiwajakopujebewavufe.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/busepini.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613baace62920---52871314153.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/51017372402.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/vejuwoxar.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/makadasogaruwejadexi.pdfIn PDF document text
    • https://12tiga.com/contents/files/lujapabogekedijasur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=spring+flowers+wallpaper+iphonePDF link annotation

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