Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f152d51c85cf8a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 20:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d613fa15d4dc4b5f010a65f4589f01af SHA-1: 40409e43bde7440ed050854176f3ba1d4cd85c5d SHA-256: e8f152d51c85cf8ae1badae41951e98e696872c0418282d0c65cf3df71beba6e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and other potentially malicious PDF files. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather for programmatic exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/24e98a34cac176287c5b66456ab74b94/nunibamamezuzagupijodo.pdf In PDF document text
    • https://agronlogistics.com/userfiles/files/2833708493.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210803_BB070E36A955D32E.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ed54557b---11123356997.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085401ef422a---josixofer.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de303fa64---bekunawezezomofox.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/92868842855.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/8d8ogt9kjiv78jq4ohu6mam7cv/majebekojusamebipubimo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/didazukipilolokuvefedibuz.pdfIn PDF document text
    • http://soupworld.de/upload/file/61424206535.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/39555602577.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/31527498215.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/palajix.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/nobojusujudekobururuz.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/vonerelitiwenuwazifaleraj.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/divowep.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671e6988af---luwepis.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729804418cf---25843164839.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2486faa9bec557972a3694c4aec6e700/61900962077.pdfIn PDF document text
    • http://cl-pub.com/files/files/90822778346.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/dukofunojajivuxad.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b19a7a3dd95e074cf56da68d49b11386/fadolowedam.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6b6d6e547115f9968e40c3b9d029e185/59833519505.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/09bb1e9cc58f20a2030105efba856aca/woligututurafunogig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=prisma+ltz+manual+2017+ficha+tecnicaPDF 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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 18524 bytes
SHA-256: 09dd31620edcefe4f294fb6f931bd3b85aade8bebb1bf493089a09a0ae1905bd
font_01_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 10984 bytes
SHA-256: 23d443a5b0b9408484a5c4020205139ef33fc9e01a31ab1d3ac39ebaae4a89ec

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