Malicious PDF — malware analysis report

Static analysis result for SHA-256 517e24077eb2f4e4…

MALICIOUS

PDF

59.7 KB Created: 2021-10-03 03:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5ad10fce4a10dc65ab04d8863de2f9e9 SHA-1: 01654f8ceb3d38601ddb1e1c8b494adc65a3a54b SHA-256: 517e24077eb2f4e4408c515d9bad9b92138066d725c429b9597de06381038f43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised websites and potentially disposable hosting domains. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=software+for+downloading+pdf+files', are likely used to distribute further malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6398

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 https://archism.ru/uplcv?utm_term=software+for+downloading+pdf+files PDF link annotation
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/aa245da6816bd1602fa60a833386ed71/21232728110.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/pixureku.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/wagemuwukevivibalepezibu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ce917d74---3870806272.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/zojakobikodopuvekipomasa.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/sulewumobetonaziwivikeda.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/razulisimefegezavaraz.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/perabevokagozoxuzobezub.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158546b1b2e6---89734827650.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/valamenesokigojirujolige.pdfIn PDF document text
    • http://tenis-klubmoj.si/uporabnik/file/firaxetepip.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20211001_1A17970F1931AD1C.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/gudukowuxedatiwokedidujag.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/23279915325.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/wasitiru.pdfIn PDF document text
    • https://austarpharma.com/upload/files/bogunowudikefumorule.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b6dbfb65f21e719bb4e8ae65a479b48d/74133283779.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/14419291355.pdfIn PDF document text
    • https://qnzar.com/files/bazutelaguminugu.pdfIn PDF document text
    • http://envigest.cz/upload/file/sabepagekat.pdfIn PDF document text
    • https://wittnebel.dk/file/selisepinizipusewemafos.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/fegafatakigiv.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/jijigasiwanobipidimo.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/45e10084655908e1bd891adc0f7ad80e/36588682656.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/50476998216.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/gonuge.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8197624770666ac0fc0386373c3b3fe9/latipaputirirewurape.pdfIn PDF document text
    • 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_off0000b92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92D 17708 bytes
SHA-256: 631ded2d5bbd6189b8ab4ead2add0536776217a21e95f8655837782a7db52aaf