Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3439e907086f8f6…

MALICIOUS

PDF

69.3 KB Created: 2021-09-02 14:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00f108b07cfca05236f3c78bcc6cb453 SHA-1: 3f6017cce1e24e0fde9a92511464cc48fb9fbd63 SHA-256: b3439e907086f8f621af854e57c13b97534649e3efc172224c8f6ba8dd373dd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://akicgiyim.com/userfiles/file/67229744024.pdf In PDF document text
    • https://pmeds.us/userfiles/file/zipawatirebisodaguxexi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/jifinasojagebebavubifi.pdfIn PDF document text
    • http://axwelindia.com/uploads/91472711060.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/digofesosur.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/efc35480964b5047e012fa655ce12ec5/gubog.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/garuvube.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161197573cdcb7---bosidikalimew.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/6aa690cf960205ebc372bf40cae6d2a3/58165474285.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125517631756---29758029111.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/83333950937.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/85457049159.pdfIn PDF document text
    • https://majubesar.com/contents//files/66312021626.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4e619b411---42542594975.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609670ebee729---kexumarorez.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/43b12be75a248c87c57efab01880c740/gasegajutitawapetabibowag.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/89321655716.pdfIn PDF document text
    • http://usmleworkout.com/files/file/21847434840.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/witavutazaxenanav.pdfIn PDF document text
    • http://eksternest.be/images/file/jegeve.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/41035692435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=familia+nyctaginaceae+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_off0000aed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED1 10668 bytes
SHA-256: 15bd5277ab983baf17b445da57dfc5deac764f86f9ffcff51c8a7baac183f011
font_01_sfnt_off0000c702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC702 16092 bytes
SHA-256: eb11e59e2cc565520af36777729168a82d051c60bbebacc35ec6eb083e0afc30
font_02_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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