Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb525efcab0e6e8b…

MALICIOUS

PDF

86.2 KB Created: 2021-07-16 02:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 48c9bb5231a2325eb2cdf7e959aa5b38 SHA-1: 3bbcfa6a48648e53bdcd0ccb25d97102dad04820 SHA-256: eb525efcab0e6e8bae142f6e52a2dfd1bc979d57e0bd0bffbfaac6edc897ca4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites, likely for phishing or malware distribution. The presence of numerous links and the use of compromised CMS upload storage suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qhs5u84ho9vf3fv6rap9a38ulp/72972959071.pdf In PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a5632aae11541b7da70b3f28cadbf4d3/26061945896.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/22fn0f8bk6g65ag60r3vo4jv8h/57666990186.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/34453680586.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/baxanizeririgaxezomijapo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/89574080641f4f7a95265a0c2fb8c79b/lixaromomumumonegaja.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/55256157385.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/46ba47337df0789778068195b0d71426/92928509563.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/4616619917.pdfIn PDF document text
    • http://soupworld.de/upload/file/pexipukapoxafumulesoga.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/sidimetudadupegigiki.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/2782960636.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vgc35spmuf6bef8f1768afou24/doloxepusa.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/lukubasijejenopebepixedev.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608167b12d6e4---bezufopimodeporuxifagisi.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/nivaluparifawagiluvonodet.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/gokilikaj.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021053023310473499.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/puligutomepazapuridefo.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/f69c7cdf4de33fedc044da7b423b32bb/faregerepas.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0932db1cd5---75026302473.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0196233b9e---tulodafa.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/rugawokekafaxumet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+happens+if+chickens+eat+rat+poisonPDF 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_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 10616 bytes
SHA-256: 9842531474803196956d44707a0ae2a3696c37bced4c7303fe34362fd7806c32
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 17116 bytes
SHA-256: 0574f6aebc937a5d43fa053f87ae6203cf7244e73e2e852ca8e2cfddc565fa7d
font_02_sfnt_off0001336d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1