Malicious PDF — malware analysis report

Static analysis result for SHA-256 41767922e076c2bc…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 12:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a9e79f2730d1ff61b17091c0dc81e9e SHA-1: 11eed3c8344fcea9866bd1d4133be165032ca1c4 SHA-256: 41767922e076c2bc96646d38ca1d9c3c4573bafc635cf484c5a8ab12a40259bd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to compromised websites, including a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware via a fake download button. The presence of embedded JavaScript suggests it may be used to facilitate the download or further exploit the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://drafthe.ru/uplcv?utm_term=among+us+mac+free
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/6lopfst7vovv9ehsetv8ouu212/lowitatuwuxinif.pdf
    • https://dacola.com/upload/files/35232782627.pdf
    • https://rtquery.reitoken.org/Coaching123/images/files/93140440291.pdf
    • http://paradoxine.com/upload/files/tusotobodujare.pdf
    • http://doanekeyes.com/userfiles/docs/33890595220.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ligesefi.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136656af0ce5---55917596837.pdf
    • https://ahl2005.com/ckfinder/userfiles/files/panunizojew.pdf
    • http://thebankcardservices.com/uploads/files/93632321785.pdf
    • https://minervatech.work/js/ckfinder/userfiles/files/77119495099.pdf
    • https://hanedantoptan.com/upload/files/kedire.pdf
    • http://altadirezione-consulting.it/userfiles/files/duvis.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136de187d231---73029608844.pdf
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/nonadovamonemukadowibu.pdf
    • http://cocoal.com/uploads/file/890426663.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/9dj5ivijjhpfd4hhc9e5t7vo08/nonoputubivafaxowefupufob.pdf
    • https://europacreativaeuskadi.eu/files/galeria/files/tizalilelebonesa.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31a8ec932---9030165722.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/duvojudubodofufujevubuf.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dea781afc---20520112543.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0c3.bin
52a17ae7544392a2284467500762bd05f689f38a1ce18af136bf60319de7ca28
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C3 17968 bytes
font_01_sfnt_off0000ff53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 16792 bytes
font_02_sfnt_off0001176a.bin
0a2dafbffcc8296a8cf95403fa1c707e916bbae992766241ede43308d54bcb24
pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 10524 bytes