Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af905d984d625f3…

MALICIOUS

PDF

65.0 KB Created: 2021-09-12 20:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21a2703c8b0a8c8d85e240ce1369c4e9 SHA-1: a912404e396caa36f600830f738a965fb46f4108 SHA-256: 1af905d984d625f3da7aa279c2c206623839c6679917919585a696e9528fb564
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links, likely to redirect users to malicious sites. The embedded JavaScript suggests an attempt to execute code, potentially to download further payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5448

Heuristics 6

  • 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.
  • 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://berbagiangka.com/contents/files/31802400579.pdf In PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/bb0fb86e527b923a2e5e06bfd5679c59/82251435026.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/92471018232.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090107185973499.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/73279325094.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/45822532239.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/bumezejajenolekutimojo.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/gewubesivilevewenatetuno.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/mk3sk6tm69ot6btpbe5k649h8j/24674313943.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cbfce1da630ca8411f254d64de4a9103/guvokavif.pdfIn PDF document text
    • http://jinyezi.cn/upload/bakogejimovedep.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/45117825759.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161332d9e3e53c---lumizovevuxabafiso.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136488ce8908---tijepopawufu.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/27926985261.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/sijaxukumopafat.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/53184955513.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/45888412769.pdfIn PDF document text
    • http://jarosi.hu/files/file/pifoxezepawewojaxujapewum.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/59949569496.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/gifazewivowisuniraxajal.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/diruzeraruj.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/87246130934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=lehninger+biochemistry+pdfPDF 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_off0000b784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9B 11068 bytes
SHA-256: c6ba69bd7eecef02dbe1e8ecf0c3eafcfa52cc58cba85f535dfb30db8d7be8c6

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