Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20e348cd3d56850…

MALICIOUS

PDF

77.0 KB Created: 2021-09-05 22:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5753a4c077f256faae275f3b8b5f551 SHA-1: 3e8cc485df43d0443e7b23d379ea1ad113c55db4 SHA-256: b20e348cd3d56850a6a92b0313195b3f50a5795ef680b5d11d84d5bda7bd345a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. No scripts were extracted, but the presence of multiple external URIs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/afd15d838aa15669104e838928e71ef1/javebera.pdf In PDF document text
    • http://farmaciafasolis.eu/userfiles/files/73955195215.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebe6a6d3a4---tileviletulasumeleb.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947c72b109d---lusefadubemujemobuwede.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/sizipur.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b6e5a2e61156afcec41bad69890db1d8/26372783098.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/pagemizev.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/81806994419.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611e96428acc4---namigom.pdfIn PDF document text
    • http://apsons.eu/files/file/julosexizunejuzo.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/baxifukagafifidox.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc60173a256---28512396406.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/zirajemoket.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/21961256861.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/31896664228.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078682fd0da3---46440411073.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/vularone.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/783966534b5cdc2a2fa2cfcfc0ded106/wadabip.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/92d4e30d832da52ca95da054aef23d9a/sopenefululinejevidawaz.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f07eee293b---55223905238.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/bozebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=apple+to+zebra+chart+pdfPDF 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_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 10536 bytes
SHA-256: 3a1ebb312e587dabd5aaccb475efc0f79f79da05e3f4a09a85f4656f1ea1273d
font_02_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 17588 bytes
SHA-256: db59a4838c736ee103ee820112abd301ec8ff73aa153b398cdcd2d75ef21645e

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