Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ee69ab11c1f88d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-11 12:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e52da8700a636f0f61bf5052e57a9f77 SHA-1: 58ceb91a1db2162efb2ca4d1db0c3f709cfdaa7b SHA-256: 79ee69ab11c1f88d07c6022df7d577cb206368decc6ad07dadbdd674bfcf6b4e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to host malicious files. The presence of a visual download button further supports the lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613519a423ddd---14298347262.pdf In PDF document text
    • https://cytairtool.com/test/userfiles/file/20210911_e347e.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/zabidarogaxelif.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/38695675042.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/nasedijarofefel.pdfIn PDF document text
    • http://ned.ru/uploads/files/pusadi.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/faximupitemoxegunik.pdfIn PDF document text
    • https://techlan.pl/files/file/31425348473.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae65b1ea7sact0ir1u7a5rkv1s/47600313434.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/26314184832.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/febonatipujasefigalidug.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/xekufotalelutoni.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/10801810057.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b832f7488f---90328839002.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/3490073094.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/57739403786.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/49293976026.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996df93d67---fagima.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/46hc8svp8g8np2but0cbq75otc/tijod.pdfIn PDF document text
    • http://wsm.hk/images/files/91498513967.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/17561649445.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/27450262434.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/visizekot.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/38412050899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+pubg+betaPDF 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_off0000d1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 10532 bytes
SHA-256: 31da479af7e9f5136fa6e5cef37007715cb6d576504e2eb25f0fc691ecc269d3
font_02_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 17632 bytes
SHA-256: bb9577dd4333f5571c61300467951261e3bf9a59065053d50f6b970b4e836a23

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