Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a34b422098dd56…

MALICIOUS

PDF

60.9 KB Created: 2021-09-23 00:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d92e55f3664bcdf569ede06af63e0dae SHA-1: 741a0194d80b833268bd326bdaf628c22e3cc9d4 SHA-256: 25a34b422098dd562a77461414328bd40349e4ed62a0a972effbfd5ac8ea5dda
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9348

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=watch+westworld+123movies PDF link annotation
    • https://rybczewice.pl/userfiles/file/50922425740.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161383f6666e1f---87906778860.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/34740090803.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/nugetuwarel.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/64237695304.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/saninewuvapobafusuragu.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/sinam.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/5974015611.pdfIn PDF document text
    • http://hydrem.ru/images/file/jareveromovevow.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/c390fa213741ecd8a4fc957033401770/nimofipim.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/38312202802.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631751511/file/manotokonefugajebesukobig.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/voxumapexixitonupupuliz.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/amsskvhlp12ksjj9stqi32hbe6/30591734051.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/riforasukejupag.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/samevi.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/81270299076.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/wesuzutepebamebawara.pdfIn PDF document text
    • http://ccadl.com/files/20210919044438.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/11918276256.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/nenojevomexiwut.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/dadaxivavopuk.pdfIn PDF document text
    • https://protum.se/file/11262369344.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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 11020 bytes
SHA-256: 2d744d8458ce645f0c741be5828fd9219d7c038309164b3631bf52acca6d5aff

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