Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde45288fa3e3676…

MALICIOUS

PDF

92.4 KB Created: 2021-07-31 00:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8d9b25d635a3649808a7a057e274bd3c SHA-1: 31a6a0e1d02939fd79540e60f300d2016e417e3d SHA-256: cde45288fa3e36766bdd2d09672401f144bccd81dff80a4ef94444c733d2e76b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the structure and URL patterns are consistent with malware distribution or SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f12995ae7764abcd42f464b36def9cd8/97107818595.pdf In PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5b5a13bc---wijuradusizopinoz.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ca01983c1f31bff5c1f86eaeac3aedc/49564278836.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc9d591ca5---65542291466.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad174ad456---moxaxomepogomakov.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/visogeminojedamunonitujo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/9611753723.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/9930660488.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b257406ef17---49048688873.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5d9fc43b3bd68672defad81a527f1c74/63735320770.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/cee2df2d4709b68887b51673cb050a35/miwijejamopipokabi.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/worogutoxuwuzunenusewob.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/dab11794bc50487997c97d2e4dd191d8/61267706758.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210604174443.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/64059759494.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/33889864547.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/jhco28s7s3gqdu3ba7qe5p9qsf/29618695833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+use+garmin+striker+plus+4+fish+finderPDF 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_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 22156 bytes
SHA-256: 766a6ab10dbff691d3011cc5a84603a2c3daa1cc9230c2aefdfbec9d18956a39
font_01_sfnt_off0001314e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314E 11292 bytes
SHA-256: e38ac78287ff0c1d46453b1821ba8432a7ee8c890095be73a9cee68ed56d01d3
font_02_sfnt_off00014b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1