Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21c813d8dfaea1b…

MALICIOUS

PDF

64.2 KB Created: 2021-09-29 04:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12c770c07dc9e4b77bb8054a6acbe03e SHA-1: 17781e2bb0ccd85e1362dac004b6bb8913a54bc7 SHA-256: e21c813d8dfaea1b3ee52d8e025bbafcd8d50edfaf59763afdbd69a38e6537b2
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with many embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6907

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yachtandgulet.com/userfiles/file/13743396027.pdf In PDF document text
    • https://mamap.in/ci/userfiles/files/19512853705.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/wafosivuxasozex.pdfIn PDF document text
    • https://biomisszio.hu/tmp/40987188797.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16143dcc30444d---54251887614.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/34896320605.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/nonel.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210907_4C01862BFABA87E2.pdfIn PDF document text
    • https://strechybenesov.cz/content/1739270029.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/18320972519.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/56362656269.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/rejuzovapijivesatosub.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/33111164883.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/921adf247777f07a5fb04ea9a928aef4/xefokutikarix.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/paxamumetazikesewe.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/tokibaf.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/54649774025.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163125414231.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/zuvuzetumed.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/34973617597.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/60628099869.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615309f7e3605---wodofiximilusutalat.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/67684601658.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/nevovajajomemilowovupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+create+vcf+file+in+android+programmaticallyPDF 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_off0000af28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF28 15560 bytes
SHA-256: a8ffd0dfe6f32330ab0768d24540978a104c5378e78ae7a7b1a9f387d9e4ee07
font_01_sfnt_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 11052 bytes
SHA-256: f05630f9aa17795f98265c3e34d414ab313547ddb74b6d0fb91439803453db7e

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