Malicious PDF — malware analysis report

Static analysis result for SHA-256 23031938717035d0…

MALICIOUS

PDF

68.2 KB Created: 2021-09-20 02:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b508e99a7145a2fd9341c74e4b872cdd SHA-1: 4105e4654e988cd79e67c8fd2c1b6dda2f93fa51 SHA-256: 23031938717035d045af49d3b4e32055aba0762e025960321be169c410a8ae02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of luring users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

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://chcial.ru/uplcv?utm_term=local+tv+android+app PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d9da8458---wedawotanugezu.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/kibog.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/kakuputisapixaregenepogum.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/nerirurivipi.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/monilubonaminonopabano.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/mejuzovi.pdfIn PDF document text
    • http://boki.hu/editor_up/15397289444.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/zejejov.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/voxovefumoxiritotewiwotu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fab0efacba9eab8f12f5219a422a7eec/ravivodinuzopegukulibuli.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/11408530254.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613438a0e36d4---karinasedodixewukanugoxa.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/mawonorapilavowure.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1e4abc521---89451652562.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/bilotojipogizowixavuwev.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/vusoxabekolupopoponu.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/21081442196.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/38efd2c2816d6ad0b787464ed4250a3c/72026720453.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210908133557.pdfIn PDF document text
    • http://geasit.it/userfiles/files/40326451133.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/79097898775.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/kunizome.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/20765397406.pdfIn PDF document text
    • https://avflash.nl/upload/files/90972840677.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/sorijetevu.pdfIn PDF document text
    • 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_off0000c252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC252 16364 bytes
SHA-256: 7e3715275c96a6bb4b5128de91e05f23e0b0e05cc81b20f7ce70ace187ac6d3c
font_01_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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