Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d7a4be56f495a5…

MALICIOUS

PDF

89.2 KB Created: 2021-09-07 12:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef8000e9e5da927deee5029617af3e0c SHA-1: 6c5a720c571ed0bbaf530700aed3617b0eb5ca00 SHA-256: 62d7a4be56f495a503a18efaafb9a7f40105c0ead3f6ef7ccb71212b47213aae
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised WordPress sites and other potentially malicious hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The structure suggests a link farm designed to obscure the ultimate destination of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c9c4c371---87537545561.pdf In PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/5b48a3c3631d53ba19af3075c6b81120/xokedopatijo.pdfIn PDF document text
    • http://dade666.com/userfiles/202108file/2021081913272770554.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081397fdf2c8---vosujuwulanofelitid.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/b61caa544ee10be3e8a71e876b6a57be/dowov.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/sotukoli.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/xorugisamazejefopujisukaj.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/58915805547.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/luwezoxokuj.pdfIn PDF document text
    • http://holzbau-napetschnig.at/lusugaragozobef.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/57089610101.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/zonexiwum.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/uq50ahoh6qld69cioko1hnp03h/runaraxegenukudaxilo.pdfIn PDF document text
    • http://ipublicity.cz/data/file/39890264691.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc18ab08ac---55530386928.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/ff2e8539aa3b9b08d3418171e3c600ea/zejadopo.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/denevup.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/53522773949.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/76616169021.pdfIn PDF document text
    • http://teplospectr.ru/images/files/58420945127.pdfIn PDF document text
    • https://deepex.hu/hirek/files/54457434992.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/17c1a3dec6eeebae6026fb2948cff891/9307210235.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/96795230256.pdfIn PDF document text
    • https://ksuskalology.com/images/file/90131048514.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd9fca3a50---35739763763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=embed+tag+html+pdfPDF link annotation
    • 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_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 18064 bytes
SHA-256: 79f303bbf93145ea631dc2328a0bd263ee012e9913da6cf6ad4632144e9301f3
font_01_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 10484 bytes
SHA-256: 41b00a8235387721c2f1a2b38e41e469706f1fc1525e94dba5f8d0b35b891095
font_02_sfnt_off00013f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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