Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a81c94c9e68fee…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 15:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a40ee83d73964577a120b7117ee3e33 SHA-1: 584bc404b3deb2deb457fb7a785e6ee9da135b79 SHA-256: 23a81c94c9e68feecdbb56b02b882331d0668ca33b5170661dab1aa252d4b425
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The file's structure and URL distribution suggest it's used as a lure to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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.
  • 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://sanagustin.cl/files/21554692958.pdf In PDF document text
    • http://ekonopuntos.com/campannas/file/43463298723.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/75248517940.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/74563138563.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/faroz.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163125414231.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/bulewa.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/50063111159.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/kesesapop.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210912163147019565.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/46677772108.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/3049151569.pdfIn PDF document text
    • http://robbes.nl/media/files/63100103348.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/433cee0ed6e9b2f656119354f85e5d50/pewobiwufipikifawivo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbfccea828---35857100133.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614533b2a874c---lasopujedukoxum.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/pefozizuver.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/febiwogozowenufod.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/kuxadawuj.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/hcct4erbslk0bv8d150urde2lf/15702626131.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/161d64acb3234d1a1a54e2e2907afd3e/83234530885.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/noxewefutebexaxezexatedup.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/xidefewawa.pdfIn PDF document text
    • http://asid.rw/userfiles/file/dimefufimedomodojuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=reason+why+play+store+not+workingPDF link annotation
    • 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_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 17920 bytes
SHA-256: 7574b34c9b83d046b5768ccf30ea2a30b638aff63a3978dc6b3656c0905f282c