Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ab62a96730c74f…

MALICIOUS

PDF

88.9 KB Created: 2021-08-01 16:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ee782bd1c2c70d2fa47ab45d0388642 SHA-1: 1e6244af1e4e9518c1aff69a60e948c9d67de24f SHA-256: c0ab62a96730c74fb9929734826d8575c495e3ad6e60d073d7477cdd995ef6e5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs and the nature of the heuristics suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/bq23g772d5s9qgbgktvdd3a5s0/27800319996.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e3f1d07f0d423182a139cceabaa1b03f/mozatuxeweforem.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/88225771605.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7793cbd1fc---97445838447.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed7e9fd182f---31142578795.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/lupuwojezobifomugezikof.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/g53gd9pv551scvo8dsbs97cpdd/19848627215.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/27972161870.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/muzofe.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zinidafasu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f102497570a---52392172073.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ecc1ebf939f7800e7056454f90892863/49694215246.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608321ab95cb4---pupabini.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/73782965250.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739885b9ca1---kogudiso.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/84065622418.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed9a634e90---86765429165.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/xumovew.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/doviviguf.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/32383710827.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/sovaluratukumokupoj.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/dodsieekbvqtt66oii6u3mvhon/11675065100.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/minijosekozobezegejinemin.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/esh81uc5iu6v1vv14fgsnso3d7/9840933032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=samsung+galaxy+tab+a+8+inch+keyboardPDF 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_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 11648 bytes
SHA-256: 428d2de6aa6e3622ce8e7402f80dd3d31f63d77a39798f62125e7665629416ea
font_01_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 17440 bytes
SHA-256: 6ae673380e43b246b142e5a1280db94648bc93aab5ead66788671af03cd908dc
font_02_sfnt_off00013e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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