Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4e3695a503db65…

MALICIOUS

PDF

80.7 KB Created: 2021-08-23 13:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98b69f6b58ce6dea09217371ef9679c4 SHA-1: 54e7301eb59d3a42e1e31daed68008a3c91cb933 SHA-256: 3b4e3695a503db650b04bdfb54b2c7de0ea965e3c364f1041d26c5f7fc2550cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests it may be used to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://pearproperties.in/userfiles/file/61549341863.pdf In PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/ribos.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/jomovuvor.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965a5081acf---potiwigajur.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/52a38a83ad0c8ee2e5137be2f46e9ba5/58392432871.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/85993034273.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/5897475257.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/63886826594.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/dener.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/vapopusovunika.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160863ea616950---reziwekejedaxivifekuvum.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2a35953d1e63da892c42165416edc3eb/basigi.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/37149938065.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18cd5cef9---84107986808.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/36932818060.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075687046cc3---vujubosamunukitabi.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/wozofod.pdfIn PDF document text
    • https://senhewood.com/d/files/14666449888.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1611461b1d0f4a---muderadazolo.pdfIn PDF document text
    • http://splogservice.ru/content/file/85331385757.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/5nfm8s1kje86p41e1n8j2mprm0/6121014365.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7c82d963---zopulekiwomazasirojoxag.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/8439456426.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f1ab1afdf---18993716743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+draw+a+robot+carPDF 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_off0000dd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 15924 bytes
SHA-256: f8cd93c72701886ec86372acfb43ca14ea25763a0dc6fa8035a6092442680007
font_02_sfnt_off00011e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 10036 bytes
SHA-256: d36d189f98dce98a3359061db631289bf4bb2235cf52ace8c2abfe8be9cf8f17