Malicious PDF — malware analysis report

Static analysis result for SHA-256 26113e2658b49c3a…

MALICIOUS

PDF

94.3 KB Created: 2021-08-10 03:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 985f945dd5b8c8ec9d07d4308ccd19bf SHA-1: 08f918e46e56f2843c2dda0a607d7a7d8db9e2b8 SHA-256: 26113e2658b49c3aac455fe8d2f2262e29a1545378896088be551ea063c00cc1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://baikalspring.ru/ckfinder/userfiles/files/molatomifu.pdf In PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/gojirowijovotewakat.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/n2bainrunafcqa49qg7bp4qo9n/44397517952.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/97291977744.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/vevuwimurulidopoweniza.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/gulopeluwepopati.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5f9b75f478c5468a2f07b2c7dcebbfda/60166912294.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/74166775932.pdfIn PDF document text
    • http://amandamaitland.com/images/file/nodazo.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3ba3a00b3---44528251357.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/de936e7e6ee9f789ee2accc2c4fe4bca/32993756875.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/60b762917ec36930020d832dc68cf59f/47981057060.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085fba5a5486---22788852892.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/683391692d7c58e378cf10fac286b281/pimokiki.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/ritaxipubalekovuto.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608abc4023e64---sapud.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a61715b0d22---dexojevelijuxawuwenaf.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161006ac483464---xezedoga.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f473c65010---2483824989.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160820b55d7928---41379605604.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/72390225228.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/32512227993.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/nepuwanojedixama.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1624978002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+run+citra+smoothly+on+androidPDF 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_off000108af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 18968 bytes
SHA-256: 1d2deb0aac628d26edf0c50dbedde6090cfe68e97726b1761095be0cb8fd5d4b
font_01_sfnt_off000139f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15210 10796 bytes
SHA-256: c37ffcc05bc0476874880c946a63e3552a77920ee198b35f10f0daf1c26af58c

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