Malicious PDF — malware analysis report

Static analysis result for SHA-256 593714e3d969bb4d…

MALICIOUS

PDF

84.6 KB Created: 2021-08-23 12:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77fcc2102071c15dbe182d0bb3ceaa00 SHA-1: 525b283fade1666f1afc27360deda25c862d492f SHA-256: 593714e3d969bb4dfa4e9d1baa5d4469fc1d71652f5adb7a539e2c819b5321ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic indicates that some links point to WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing pages. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://artecgroupservices.com/imagenes/file/nipaxufasobitatosakowo.pdf In PDF document text
    • https://koncnc.com/genelresimler/file/xagumimerezi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098197b59637---vapirikima.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/65744900207.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/foxobuj.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/pifize.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/sozagimitodapeveg.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/27593981756.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/jonazobavaberum.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/118901cf9cd0369d2ca458a42ff7a597/lawegipodomijubixifi.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/38781156482.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/6d86cecfa7de3cb15f228841230e06ba/zasarezimulokibozobotubif.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/27047429097.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/78231618236.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d31b1006459---feretog.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ceb2e5c78---35418060687.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cac1ac6fc2f---57148995481.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d08e225ea---47038508507.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/vigowa.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c7d3aabd0f20a2712198700c3568a136/memakunubojaneruwobokojaj.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/xigidanezimapomajo.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/ponemede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+yellow+paintPDF 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_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 17472 bytes
SHA-256: f7f8a612acf9d332e2388497425258f7d63d983085eacc56afd713ac10b3cca7
font_01_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCE 10428 bytes
SHA-256: 6d841933e16763f99035feac869b7035b90b7271f01a0ba5d5f7b8e4be35576d

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