Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3517ffcd698b30…

MALICIOUS

PDF

77.7 KB Created: 2021-07-29 16:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf45510facc7be33b9103fb08fb5d3f4 SHA-1: 41bbef937a1328b626c7f982e8b6488ba5357345 SHA-256: 4f3517ffcd698b308a80c382c21bb9861eba27dae927e3920679839d4fc29d58
154 Risk Score

Malware Insights

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

This PDF file contains a link farm that directs users to multiple compromised WordPress upload directories. The heuristic firings indicate that the PDF is designed to lead users to malicious content hosted on these compromised sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7548bea54---54338070836.pdf In PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b77abec9ea0---66598484841.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a08526464a5---19570340338.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/60528834282.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/3g9g1hh676mb1ektd3oa7nkdi9/93481258421.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c313836bdf---xuxixasikoxevowamolir.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/89bb1527d864e0670b8de97b4f8b9ef0/kakazegi.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/gugovofika.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/44541465056.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaaf65f774---66150424631.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/limajimebilatenurok.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/99228033542.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/jesemu.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/69522488118.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/wenujedezonodi.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/669b77c7407a09d0fc8e31d08b65032b/88223230194.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/80810377591.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a2c7093a576733df2670be74bb51c3a1/rapawataj.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dca1459be---58041171182.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/96886161740.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/97594878449.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n6esfkleonri09o8ufdqpmtt53/lenubitizukonodabel.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/95656754813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=romeo+and+juliet+pre+reading+questions+answer+keyPDF 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_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 11448 bytes
SHA-256: 23ff829bff8d8e689f84d6e1e524c9bebcfca68bcd368da0f17ed367ba306c23
font_01_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 17248 bytes
SHA-256: bc8a63008a4b5e32d4f1bc80c0b730bedbc7f45fdb1e0ef788bd126c7aa90ce9

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