Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0cbad3fb51956c…

MALICIOUS

PDF

93.0 KB Created: 2021-09-11 05:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 17de3cbd5b2434068800de17b0f4381a SHA-1: 45a8b7f7ff7960ed8c2dbbddf5e3bbe3d4f0c635 SHA-256: dc0cbad3fb51956c02f1f1b44f8457d2985b5c57193abddfc4ec91e599609d8d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://coretry.ru/uplcv?utm_term=limbo+full+walkthrough PDF link annotation
    • https://cplastik.net/data/cms/file/20853075423.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/pamagedut.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/92932738399.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/44014682934.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210903040509.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/lumejiz.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/22081256601.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/84327362630.pdfIn PDF document text
    • https://redac.ch/upload/lebelovabo.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/redaxig.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fv83rsodju8npl5033qoi4lhp3/wativajopi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac9bddf72---lugagol.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/gutogano.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/95473633394.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/50605820415.pdfIn PDF document text
    • http://hidropro.hu/upload/96408642918.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/73528794978.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27201516280.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/43244018069.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/33668385159.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/xelojuregogubugaladedavaf.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///nigotizosilopufatipodafo.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/dodudanurunojorapu.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcab632562---lojipodaxofojerusaveravop.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/pogupapajuzim.pdfIn PDF document text
    • http://dnepropress.net/files/file/67218807941.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/kukop.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_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 21472 bytes
SHA-256: 48709d9a3188aba986a0452e7351825ae91473254098440e66d9771233a58a14
font_01_sfnt_off000135e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E6 10632 bytes
SHA-256: 08ff777834b82020ec3f291578a9213db3d489f7a64e07992e43d86060ec2141
font_02_sfnt_off00014e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1