Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78db120ae990a3e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 10:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 73ebbdcd69c802fb45ce37e9d726c856 SHA-1: 9c0993cb80b257bf34b182dcbf4b24eda0b6dfe7 SHA-256: d78db120ae990a3e50fbda4f18042416a11a4467f872f66ec5d34a152675a56d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, a common technique for hosting malicious files or redirecting users. While no scripts were extracted, the PDF structure and embedded URIs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57df650d2b---pipililosopo.pdf In PDF document text
    • http://beergolfers.com./blog/images/file/47197529151.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/074ed6c0fd42b54b552ed001a12690a6/78878155765.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/60792511285.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a04f5dd3b70fa547820be0d949c65b05/masiwufus.pdfIn PDF document text
    • https://85097781.com/upload/files/34746793909.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/65982021798.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/84772442284.pdfIn PDF document text
    • http://webursitet.org/Files/file/dixumozojafevuzive.pdfIn PDF document text
    • https://datawire.gr/files/files/fiwabusozolawokufoxok.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/21426006745.pdfIn PDF document text
    • http://qdjshg.com/files/file/7714460898.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610c586f59a0c---zofazi.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089250760f3b---lopenidun.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/sidovazimibigeduze.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/logijuriwavar.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/2e19f2450c87da0ddb3abe5775daee1f/16590083876.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/dufojugabisagejimuzu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/je5p015lsqe2ai3sr7ann1vlgu/95327950191.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/moloj.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/tadiwuzizizosilonena.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/vujisisuz.pdfIn PDF document text
    • http://rurisnet.org/images/file/kewemekokefi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be254a6ec7d---97834979870.pdfIn PDF document text
    • https://clinicscrm.com/img/files/24994621356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ed+out+of+nowherePDF 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_off0000d7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 10152 bytes
SHA-256: 29ef28cd628378a665462ab97811e60a2278bf87a7aefe1f4718163c93fc7879
font_02_sfnt_off00010681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10681 17440 bytes
SHA-256: 325e94b2ff8d21ec403c962733af8c6b29246f1464c0f61a0535e5c0d697c9ca

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