Malicious PDF — malware analysis report

Static analysis result for SHA-256 3753be599f52ebbe…

MALICIOUS

PDF

74.8 KB Created: 2021-09-18 22:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0833d4c60386abb0c02e3f79399b2ba6 SHA-1: 9abb3e0ce4503c8ecebb6ff906821ebacc52c52c SHA-256: 3753be599f52ebbea697af3450e6ffe0d96a2a00acaadb8d379b38865f031b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=breaking+news+photo+editor+download PDF link annotation
    • http://salamatekhanevadeh.ir/ckeditor/files/files/meluzeje.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/zewezamokurakemovetaf.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210913143531.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/88072679345.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/54773620482.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/87751568668.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/wudisutoxanifuw.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/66205101673.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/671f99692e32e8fa3c6fd6206dd1fa87/fadux.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/wupekunuzesese.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/18885878866.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/nozumiboteriweponidireked.pdfIn PDF document text
    • http://devison-matras.com/upload/file/41561001123.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/suwimivifusutadewezeg.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/beletumojepudux.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/18633837956.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614119d8be413---75798511925.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391594aedee---gefazakukujizopa.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ca0ca84f4---loxeser.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/50435764486.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/39059b8a887b1126d507c33ef1b15b86/72291887594.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219865034411.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_off0000bf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 10904 bytes
SHA-256: 16242a1c2e84857ec5dd684ee14f39b2c335cc732c2910809704914fd458d811
font_02_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 17396 bytes
SHA-256: b0ffc3ebd8d82c3be38d66034ef856b9bec5f4b29aa24bfcf97caf8d33854833