Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a46dcc3b798427f…

MALICIOUS

PDF

87.0 KB Created: 2021-09-20 22:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85236e37a1ab408cc6d87d131574c161 SHA-1: 92248609509890b7b99b7963caaf8cdd8f803f53 SHA-256: 9a46dcc3b798427f81dc0b984fe858dc46b6a733949bed27dbaff116b63b5885
176 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Heuristic analysis indicates the PDF contains a link farm pointing to other PDF files hosted on compromised websites, suggesting a phishing or credential harvesting attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/lexov.pdf In PDF document text
    • http://bio86.fr/userfiles/fichiers/95185881215.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/75996962408.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/53902977882.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/55858461988.pdfIn PDF document text
    • https://cowik.pl/upload/98587250360.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/4999953646.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/666767046.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/164bf20bb511a62f2489dd5c1a827d09/22528887032.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140c4a470fdb---buwejutebozitizusumelip.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/kunizakudibuzug.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/lobalaweporojubowubobikex.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/64790091201.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/woxonu.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109050021525483.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/zozotiseluf.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/24201039358.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/70335377527.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6cb65a99e---31869112193.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/41756543201.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/mozezofutunudarutexuwodok.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614001098a13e---36237274982.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/xavide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=redmi+note+9+qr+codePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 18092 bytes
SHA-256: de635872f40add043af02eaca0978aeefa0a02791e4c139ccb0f52726b93c800
font_02_sfnt_off000136cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CD 10516 bytes
SHA-256: 86145e4fcefc9034c6a94e2ca8ab05a033bf50f2a8ebb0cb95780f7d1b86a278

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