Malicious PDF — malware analysis report

Static analysis result for SHA-256 152fbbfe5043ee32…

MALICIOUS

PDF

82.6 KB Created: 2021-08-15 16:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9274201bdfffa1e4243ccd57d1d7e27f SHA-1: e00839ed35a5d0deb359e00b7a8f478b06be08d8 SHA-256: 152fbbfe5043ee32ae8f54ed9c7c96417ea0338a3b69394ad06f41b4ca56a7cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • 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://garglob.ru/uplcv?utm_term=holt+mcdougal+mathematics+grade+7+workbook+answer+key
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/dccb90473db730f69cfbee6417942153/pimasakavokeweluwawi.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/fiqctpr3is5t5voukkpea1h754/94999440690.pdf
    • http://specimport.by/files/files/51355500813.pdf
    • https://langumeistras.lt/i/File/68509940473.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c16ea18b---bapagazoligobuzenafi.pdf
    • http://dyglas.com/userData/board/file/wapusebosuferemudizeno.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc79cdd393f---94204165021.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a6a9f35d8e662a2bb4087704e9b8a219/90884069698.pdf
    • http://funperm.ru/content/file/74934591032.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a24a6155c---50147575684.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/2672328249.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2477b974f---zilanob.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12035070000.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/97293094145.pdf
    • https://beautyyaurient.com/editor_upload/file/6851836684.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf757d155a---sonutabonibozejage.pdf
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/fipesozudisosaw.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2c385e2780690b12c87f6851cfabcdae/52449085556.pdf
    • http://ekotop.eu/userfiles/file/54633590718.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_off0000d859.bin
48e5ec5afe6ecc2d1c8559501dddabadd35b0396088e020d9817c8ba0ef2f534
pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 11388 bytes
font_01_sfnt_off0000f2e0.bin
c011ac82c12bbfff92768306eb1a78642a9291ffb26ec193832ea4c33aa2d091
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 17856 bytes
font_02_sfnt_off000121d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 16792 bytes