Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e926ac5d3b8fc5…

MALICIOUS

PDF

71.6 KB Created: 2021-09-05 02:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f506cb54c39186aff4bd9e3a2d2cb34f SHA-1: ffbc4b1a54c11532c9f6b3c03115949328f83375 SHA-256: 24e926ac5d3b8fc54b92e3b6f214dacec67fd07c786ffa7ddb937ec08d020288
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. The document contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of external links and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=overcoming+intrusive+thoughts+book+pdf PDF link annotation
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/famolirawubonale.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d46337062---22439709266.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/vixonevomixuxigato.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a018f1589a4---depubopixosiwazogojazud.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c5dcd95fe---nujelanexi.pdfIn PDF document text
    • http://minhanh.com/files/fenupegurasepetibexifadit.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202108121419075247.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/37610148935.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e1dc7c46---ziniperelejapekisulifazap.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/zawuvufigudatituzit.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/83579159215.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/vuxumizusugetelinewowijul.pdfIn PDF document text
    • http://schokofontaene.de/idata/48340016513.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf95a7b5459---91888178099.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae2d27ffe8---5465316710.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/6844003096.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/13562952815.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160754cc38556e---96217414706.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/81211698288.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e51caba03---77902555259.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/dbl1cn1a8endg0s6541mgml3pe/61939429125.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c4f2ca6527dc7f6f3b347414ad11c864/45014825897.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/00q1rludos8vfpa4rncfjnuduv/91275056338.pdfIn PDF document text
    • 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_off0000b6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C4 11280 bytes
SHA-256: 90cba25f5bef4a37d68e37150817799466367e0dc871010e26a7232c51ea742d
font_01_sfnt_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 15568 bytes
SHA-256: 46802dc06927f3f215ae7012d8293681926f2dafffc3ad0ecd7c8dc887dc611d
font_02_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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