Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3babf90e5831657…

MALICIOUS

PDF

69.5 KB Created: 2021-10-04 10:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 19282f2a67e55627e7aab689c853862d SHA-1: e5103be0ff53d3fd9abb8b68ebf9c0b4c6173daf SHA-256: f3babf90e5831657379c767233d879fa9d8f21d95bbf643b43748c5bc33c8451
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous links pointing to various websites, some of which are hosted on compromised CMS uploads. These elements suggest the document is designed to lure users to malicious sites or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://contact-house.com/fckeditor/upload/file/rodowoberusodedud.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5fc10a133---wovuzetakiraro.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/rasemelojalaxile.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/fezomatele.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/kinasi.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/xeneximotekadoxufusata.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/nenumidagojunowadisukige.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/lofozo.pdfIn PDF document text
    • https://guijek.com/userfiles/file/rejasev.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3da6a4e1ce0eac9c0dcf4068bdc321e/80285256624.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/jilosidoxopesipomu.pdfIn PDF document text
    • http://dobermanncz.eu/files/nefetenijanirad.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/63643490608.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/gifunemuzeditulo.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/xejerulaz.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/ludazokerona.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/66601532622.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/7121832295.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/wilotapureper.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/39174856372.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/9682009839.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c68ca32b---21797811356.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/vibofi.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/9122881675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=newton%27s+first+law+states+thatPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37F 14620 bytes
SHA-256: 7802a83be0f1defe033666504a5098a55c675f9bea7c286dc14507063c5be01f
font_01_sfnt_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 10408 bytes
SHA-256: c1ee83c8d137d0cd0c2a86e6eb3f417a540f1a9d939b9e4e4d162c471097994e
font_02_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1