Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9eedcef8fa8ea6…

MALICIOUS

PDF

78.8 KB Created: 2021-07-13 07:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e9836274062defaf1d090673015b0fef SHA-1: db66380779fa15fbc3f3864efc26cced66e196bc SHA-256: 3b9eedcef8fa8ea6fd928c3798ddafc15e05012e75358aeee76f660f14f78fc0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. This indicates a phishing or malware distribution attempt, likely using the JavaScript to facilitate the redirection or payload delivery. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=murray+arms+orkney PDF link annotation
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/97bb2a61d62af4bfd5a6090aaec7f1d7/5507317908.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e20138b698fbcfa37729814972c7daa7/30675217627.pdfIn PDF document text
    • https://icbacademy.com/upload/files/7004056150.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1a6958000---radufedakujo.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/latekofipixijut.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tb7hbsft0u8bgm4no21qh78hi2/muxag.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec2c8b75f---73412622878.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/61351292362.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073533cb086c---wuzulo.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/fatujubugexilo.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/mikavegojojosudazi.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c850c52821b---newalarilepegenibibolet.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/34418496341.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df8120b3587---29614210416.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/merogonixaxokojawolaperad.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/63808726243.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d10e815c32---suranudumepudupelodowixi.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/74149301676.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b08d1959012c67e87bce6ef04875ce81/80287919041.pdfIn PDF document text
    • http://samtle.net/ckupload/files/xusuzejivepuxurixoxewof.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f86a1159---gudonuwunetagid.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/zoparupemoxuze.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_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 10332 bytes
SHA-256: 5d07debf1398ee3ba89d5f3baa982d6afa76288b1f2483ebf80bc9fc4be1490f
font_02_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 16812 bytes
SHA-256: 6307a6040286dab6fdb1193bf02a4e8eb2210aef9097c1dbc038fbc73ceb44b1

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