Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd24b171392f5ef1…

MALICIOUS

PDF

87.5 KB Created: 2021-07-06 21:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5e30de386849b473b8ff7358b70f36d SHA-1: 44c7a6490e8e30f78a64a5d5ac4ef0479609c1b1 SHA-256: fd24b171392f5ef135a05d7c270ecad9d938ada620b2f1b054b1b9634e4959be
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/cb2ba3ca644b4da9708f9aa31023c630/bofagepukib.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/70012714586061e36164b69cae662ea5/fukasizeramovonafiv.pdf
    • https://rzfmuhasebe.com/userfiles/file/70175294994.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/13ed85968f5e3381fd5db72fcb8eaa48/60189260998.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a345f4f1e2---rojiwe.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/hdavbtb01fbi13lpg291hrmqgm/618209526.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/01dde436334a83995c8b3082ec010c00/79635013917.pdf
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210621_E4E98EC167DDF918.pdf
    • https://shen-su.eu/gfx/userfiles/files/tirotanobanuwanoli.pdf
    • http://www.kickcommerce.com/userfiles/file/17215924749.pdf
    • http://gloucesterclassof81.com/clients/23558/File/vepozowasasigevaxumutode.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160869f720dd76---57448346654.pdf
    • http://ahkjt.com/upfile/file/xajur.pdf
    • http://daimarconstrucciones.com/images/admin/file/74215692880.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b475d4011---66604937968.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51c2996bd3---siworoziwel.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/31395574633.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/461a38e549243dc94efeff60fc645027/75220857902.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/f4067e50a27bd2968b3f8457c2ff0c4f/nasawugedaxeni.pdf
    • http://garageanything.com/js/upload/files/zoduporevip.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/81471adae956ba864565b4f25b2df668/99034459711.pdf
    • http://olympicburger1988.com/uploads/files/90874246883.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1cfba8a1279c4206c42a4f57f614b434/51913411011.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=simple+apple+compote
    • 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_off0000f2c6.bin
17bf473cf24d57530c687b04385c8892b07fbee15b2f302e4bf680ea88f53873
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 17756 bytes
font_01_sfnt_off0001218f.bin
48a935841279ad0ced60a3a4074f50919bfdcf4f3099e394455516e4735a8ff8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218F 10240 bytes
font_02_sfnt_off00013895.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13895 16792 bytes