Malicious PDF — malware analysis report

Static analysis result for SHA-256 81213d99bbc8be55…

MALICIOUS

PDF

80.7 KB Created: 2021-09-11 14:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73ccfe45e530cbd863974af7e5ee3b5a SHA-1: cd5d561e62b780bdd7042e55244d453770b97af8 SHA-256: 81213d99bbc8be552c48ac881834dc635df6fb6cd19f17179d7d76205db188bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI links and compromised CMS upload links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=watch+my+hero+academy PDF link annotation
    • https://godahoian.com/app/webroot/upload/files/totanirokinuzemijeju.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/83575268275.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/webomavuxomalomewemazig.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/43062604921.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/59948718821.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/eq88or1ruqg8vuo8vfc0tv045g/81201701559.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a368cef27d---56454546726.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/kemagukiwebonop.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/zixiwaxumawuvunus.pdfIn PDF document text
    • http://normel.org/files/upload/file/1455826427.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/31090909394.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/gexov.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/clk5h805nqbq5ds89mt0t96s56/42424218575.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/zubuzutidivamuzu.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/wukumezage.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/sufawumebedonoxuxo.pdfIn PDF document text
    • https://digireg.it/upload/dinefaj.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ea166b0bd---febudurofalojedapozufi.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/14376002665.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc1635dc4---81288585806.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369c4acb132---losulesaga.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/3500325862.pdfIn PDF document text
    • 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_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 10332 bytes
SHA-256: e2cc40a82d5429e7007ebebab9f2a5a78dd93ab4a0b2aa68a2d29271ff46339b
font_01_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 17524 bytes
SHA-256: 54d1afd5c03a8c85f165761f3fb4c26e216a79080aaaac05596b11eddb307502
font_02_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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