Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0d964eec81f5e8…

MALICIOUS

PDF

93.2 KB Created: 2021-07-15 11:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c82a87b2757e8564f1f004c7aa4277a SHA-1: 52da031908d35c0f8e20d8a913ba3a381c4ca6f6 SHA-256: 4f0d964eec81f5e89baa30874838f0857bc95a05e2f014eed4f4eff4921d0f41
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The primary attack pattern involves luring users through a document that ultimately leads them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b315b4dcb04a3b6ec845d70799f9503b/79473430856.pdf In PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/28173883287.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/taxejopuwa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c497b086775---48949369148.pdfIn PDF document text
    • http://bliksis.ru/userfiles/file/80656525378.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/79911939018.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/bupajuferoxuwi.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c6fa373f0ddf9500bc35185cf3e8d195/8387569821.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/noxekizolek.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/91655588597.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/97eba21e760f91df993a695eacb5598a/80436748492.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/45901733472.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/makokiveribewekovibu.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/48249931868.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/57983831129.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/xulowogevalazalibesexom.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095b734bf0ad---gafogepasaxuma.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/82175719433.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce70b6a8f---xupimu.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/pozokonumetoxes.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e96902e86f4eb3f7ff0ed52bda44dda/fesixiguwetefogifexepig.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/21042833841.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/o9jmn6sos47evgh17tj3lgmjqr/wuwolisobaritaxa.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/5507e50b04ff3836d293af2104d1d52b/3302993160.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd452dab1---53242554767.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/tumig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wbcs+optional+computer+science+question+paperPDF 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_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 10916 bytes
SHA-256: ffa63f3bade298ce8c1e9b1f5b7a9ba07829f3fa989cf635e53aecd12dd5f5ad
font_01_sfnt_off0001228b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228B 17164 bytes
SHA-256: c5fc8c88806bfc9eba3e4f8fc83b05a890b3b7bd5563db7b7f079136052a6bc4
font_02_sfnt_off00014f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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