Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef4311826e69ec0…

MALICIOUS

PDF

87.6 KB Created: 2021-06-19 11:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 77ff6cacfc489f5ee7cf6cf4e2559a81 SHA-1: a57c411d151e8228e663403582346c3273eec974 SHA-256: 2ef4311826e69ec031669b2e26bcf4aed30ee128515679fc66e5996658f639cd
164 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the 'Free download' text in the document body further support a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://inwebjor.ru/uplcv?utm_term=free+download+preset+lightroom+dng PDF link annotation
    • http://asiadomainstore.com/userfiles/file/71492019942.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608078f932ac2---ragamofewinotedaxaje.pdfIn PDF document text
    • https://33mobility.net/uploads/files/39126324824.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/nisjgkt5vn6i2f1o0ej2u6ra08/zewobigij.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/muzosiwe.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/614ce82585165aa0e4c16cd51922eedb/68372772154.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/noketogifo.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/laresobug.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077e79590cdf---jutaxulekirovilika.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7ace1dcf5280754f740c474d8ed53f55/nuxufagugumawapojotajufer.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/2266a207699cfe1da97351f85a8cd20e/52281010360.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/suzewumefalupem.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210601235252.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/bf8f202c820ac6e39e5be7cebae42aa2/kofubajozirig.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/4qsdfl0b0m2nuve5vhnifo82ig/35361904416.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ba274caedc78dfbf57c3fe74a716b86e/52902022253.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/ferezasofi.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/nvmq5egu8qfsndi5h1n2e9iok4/18998623453.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b948aba9b1---60377834579.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 5420 bytes
SHA-256: 793812e62e9fa7e0e1ddcac7e8c07a1da09efca2aee9764b7bb90e8226d5d4ad
font_01_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 2144 bytes
SHA-256: a919713b394202f9c2763e4b71107371f24aba80c2aeb5e22a089d9616059e8d
font_02_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 12816 bytes
SHA-256: 08ddbd17e412cb224d0e63ed57560d33a9bbdbd86164b1f3252a0bb2800accaa

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