Malicious PDF — malware analysis report

Static analysis result for SHA-256 531e2f49d8ce4715…

MALICIOUS

PDF

91.9 KB Created: 2021-09-05 21:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cb13321420ba69cffac7476d0f518b5 SHA-1: f224ce1fe484aade8b108e4dabca000b87988cbf SHA-256: 531e2f49d8ce47157afcca0c8631802414b0105af2ad2c57f7383960e1123fb8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and numerous external links align with techniques used to obscure malicious destinations and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://autoandtruckrepair.net/nbloom/fckuploads/file/33486468729.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6159c78b3f---makopalota.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e2607a027---55967352306.pdfIn PDF document text
    • http://burke-gallonfamilyreunion.com/clients/28163/File/87469903510.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/23999847877.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/juxujetolagik.pdfIn PDF document text
    • http://uci.ir/userfiles/file/nelupipade.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b98c4d39c8b---35771545470.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/448d1597c28f2cddfceeeb89ede15cb5/57582192361.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/d9152bd1a7ee26ef2fc6596125f54c9f/4756576000.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/zilatetexotunusalosinefen.pdfIn PDF document text
    • http://dd-eng.com/files/files/26749597358.pdfIn PDF document text
    • http://lhs1965.com/clients/880801/File/roxipuvif.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d87e5d96e---luwokep.pdfIn PDF document text
    • http://tele-video.ru/upload/files/37376830462.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b3ebb441e6a087b4244d39eae2f133c3/wojorizexegebo.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/7001109211.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/sijetudalaxorenozov.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede6ec64f6---957377957.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/rizuvidetes.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/aa0e2d64ae4464a4132fdc7d6e03f652/58148938999.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16119f3a414ef4---sepubuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=system+analysis+and+design+notes+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_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 17660 bytes
SHA-256: d5352473c3c8ca4e8c960fef0e37a0a21ff45c8465279fb09bc93313f8bf0f8c
font_01_sfnt_off0001309d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B4 10928 bytes
SHA-256: 3a07da43967e41b4716196535ada31e93450fed2c688d8a286645b38a0ac54ac

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