Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15c65ef227f1360…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 03:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 457317979ebcb6352dbb800be9026f48 SHA-1: f833ef0caa2f081009441a67dbab11b83275f518 SHA-256: c15c65ef227f1360be2ba1ff19149661af9f1d5f5cd0ab258b993362393812e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://huntic.ru/uplcv?utm_term=creating+a+new+d%26d+character PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613177bb28349---56937163869.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/fozeg.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138172ab1055---26017965841.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/kixuka.pdfIn PDF document text
    • https://webmenuplus.com/images/file/giketusuzamavujapenidon.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410fd377f4d---zafiwuzak.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d57c200207---veserawased.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8f006296a198fdf0f743011c3ddee74e/nelujisix.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/16561733140.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e12d743f78---pakoritutoguve.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/letifunugifadi.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/14176247073.pdfIn PDF document text
    • http://podarox.ru/public/files/lajafosabob.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/perebadisokunezaje.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/mewomopokukuf.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/91617178089.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/93547129536.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/17875946973.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c43cbd3d48c52618b6ff803409457092/507542743.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/nakipazafujofomela.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/70206577829.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/rakudaz.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/29551610105.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/suguxex.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/napazepitabanubuwijini.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/wegumek.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146232598f1e---teraxaxatoporagunoz.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_off0000c11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11A 10208 bytes
SHA-256: 987540c9d036937f022f342cb9e5e501e9eed39296a1e097f7bc8994ffb1cb3a
font_01_sfnt_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 17316 bytes
SHA-256: 9dc1807d79ffd28e61ef5cb29eaa9cc1c0ecc00912329feb18073f01339930c4