Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e010f638a16de3…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 10:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d103d4ae51976d7b5107c85bf7ad405 SHA-1: 81bf6b5380e06f25bc21fc4f705e2b9f7f181f3a SHA-256: 98e010f638a16de356910dc2980204a5352cf38a825d0474986f7e64113b9f0b
162 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites and disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to external resources, likely for phishing or to download further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5345

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
  • 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 https://edusfera.pl/upload/file/56627901215.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a6b600d63---56554983224.pdfIn PDF document text
    • https://digireg.ch/upload/54473411873.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9afbe2dd7---2325958549.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e53e6a401f---walivawogozuzu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ba755f25ce8---38140299754.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/jitulajegalirupiziwido.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/57aa0c8c9c3c2ed88e58e59801ebabaa/59924577765.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/bepatobesiwezafubejofini.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/019aab22f610d5a659a058e224121a77/71558429155.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/towujili.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/buzipuxetexifuvoduxepege.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5f2c2ba67---17823521407.pdfIn PDF document text
    • http://deltools.com/userfiles/file/3339576668.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/jofokukami.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/83026123384.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dc2b20161---sopopixoripuzokafepixure.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/6bq3bjp5uftf6bih72or62i840/24996606471.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/74103896205.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16073710d49b8c---14881374988.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bd64ef86d---fevuxawos.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/65845186403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mikrotik+routerboard+rb951g+2hnd+manualPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/foxipuvupukoxadil.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 11328 bytes
SHA-256: 7bfbcba82d8fe7c2ef52685a6dc5ef45808643f2194580b638548538106644ae