Malicious PDF — malware analysis report

Static analysis result for SHA-256 21af1800da580366…

MALICIOUS

PDF

96.0 KB Created: 2021-09-01 17:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88545410c3c79f86869cad71d52f623f SHA-1: d45a1a5b2f750282f51d07e9e2aa635f3ba1850d SHA-256: 21af1800da580366bcbbb7bf56c821a4896822df702ceb7bf19163ff5ac0e86f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0cc6a0970---87410309329.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb6f2f121---woferosigaj.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/ludodiwopal.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/gatexaxapuxof.pdfIn PDF document text
    • http://dso-fuzine.si/docs/vopojevifi.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/lizitepo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/cfokq9ld9m51h15t0db2k1haer/wudule.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/6hb7r2pvfodm35rjq6qg8oniqv/7420011745.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3cebbbaba---91146364946.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/14305869199.pdfIn PDF document text
    • https://sharenkon.com/files/lonileruzipunalilexarix.pdfIn PDF document text
    • https://dm288.com/slicice/file/71271348757.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/fceedf4db5b15ebf08c859cc7de62aea/wosebexumitizaduxofoxab.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/b5cda78a0a7bdae4b6850e41cfac2a09/29578254507.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/5c4c0be6e3f7298b8b59275725e17ed2/51724214104.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///39956007394.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161139c8a83307---kefinetilirujetule.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/rametikerasasatixiti.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f3m0h911u33i2i3mefn6glp0c/mivotarivugilesol.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/25146569603.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507004429955.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/99261658366.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/dewevifitajuboluv.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f85ca97c0---77876747112.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078decfcb450---xadowolemiwanufom.pdfIn PDF document text
    • https://soechi.net/userfiles/file/xobepozibafobosivu.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/fusagekakurorikalafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fifty+1st+datesPDF 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_off00010fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DA 10120 bytes
SHA-256: 92094054adb60600214cde72eb4ac27adbb3f8e62d3e3b9f3670e324e9665bcc
font_02_sfnt_off00013ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA0 19948 bytes
SHA-256: 37a404b4e852bb43d2a35efab61f0a8e799c0ebcd2f4ad852212f11a16b0ce5c

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