Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ac6a286ca7b105…

MALICIOUS

PDF

39.4 KB Created: 2021-08-14 18:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 61af9c5ee00864ff0510bee87e2a98bc SHA-1: 379df3cb31678a6034160157f79e5eed2f5326e9 SHA-256: 21ac6a286ca7b105baa3086ac17e7ddabdc45b76261265948843e92b00b047b7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8821

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 39 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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50ca9d3e5---birazijozutepomigobamo.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/073ebdd51c98419cfcccfe539539abf7/mifadesiromipizajera.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f38a22c564e---79444494018.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e37d27d3d4e---1166787466.pdfIn PDF document text
    • http://billsky.ee/files/file/70835766644.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5129c1b8cc3927a778346fc4ec5e94a9/sowigosugetavejop.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a96dd2430e4---leguwipolewep.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/57619325578.pdfIn PDF document text
    • http://lawngo.net/fckfiles/guxorigiziw.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/mexakulawamasezud.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/38608641814.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/nfr520pv4qoi8giq1gn11al58d/46449876154.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/c78lvpof1o858m7j1sp106hvcn/3139883385.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504234958444020.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087a12255480---6993047655.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/21170052424.pdfIn PDF document text
    • http://www.emporiIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=minecraft+dynamic+lights+1.16PDF link annotation

Open this report in the interactive analyzer, or submit your own file for analysis.