Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9b33f87ce9b4ca…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 22:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 530e7e66fcbd083f974538e54adc34ce SHA-1: eede2890d4e4d40a2bae9e2dd5096a02b363a1b4 SHA-256: 6f9b33f87ce9b4caa891c5ff72e0063faae1c86773541681d56e4f64e9bacc93
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8235

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 http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58861425379.pdf In PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/66641552902.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/40374545731.pdfIn PDF document text
    • http://rc-modeller.se/images/file///61369370525.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/38073772346.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/dofogedefakoxipim.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/54224489415.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gonotofemuguwemir.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6e84799b0---15105563186.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/fidodosom.pdfIn PDF document text
    • http://www.77ice.com/upload/files/runugubimamonu.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/walidonejugigewulurubunav.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/94375292756.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/mosowupepugoxab.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/41235471514.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a89b44b8---zodotokuxusubip.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/643vbhgt9jjund924ne3ajpodg/xewuwelapota.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/xigarim.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b74b7c6877---welofetesotewikikosi.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/88667091029.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/vogetinubanuzonig.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/71660145046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=book+reader+app+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 18620 bytes
SHA-256: 07cb32f4a4395b5079997095e196769ac8fb29bcaafdf92e3d10439c3e866066

Open this report in the interactive analyzer, or submit your own file for analysis.