Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fd33fb057ef944…

MALICIOUS

PDF

64.0 KB Created: 2021-07-19 12:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b27998d63b260a98ad83c2d864dd6b33 SHA-1: ab529640b20d9f46d0afbdf55862bbf634010aec SHA-256: a7fd33fb057ef94471a64faad7c86b9c8b70032d603c4ac0171b6e0e5875eae6
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, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to obscure the true destination through a large number of links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5245

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://flardochform.se/userfiles/file/zilugezik.pdf In PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/komiwifawulosebavufoniver.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/witulobetedagava.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210716_C5A22078E34CF47E.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bf06d57b1c2---84779441757.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bcd96894f---10695618173.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/luxonotorabuzipimewari.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38b117edf---41066598483.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/murisikuvoruzizigotilosi.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/2na040p6q0ui8pjpmoi0b1gtqn/74153976087.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcfafa3a2c---52448356145.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7033739b---27765903563.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/rpf9nuh1q27c34vbrlgsnt5gt2/50345964523.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/fogezi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085226c62f96---73230694695.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077250630ab6---jixirozir.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2945921e8d---xovabema.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/68900493057.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/tutipagigifowe.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ee926a93c---69850615239.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/gobuwigiv.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608190a087b82---rusazoxewizezesob.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/74244420327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=trapezoidal+approximation+calculatorPDF link annotation

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