Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac976cdd9c0a2ea9…

MALICIOUS

PDF

75.8 KB Created: 2021-09-26 05:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 37c3af7585dfea5b4a9c8e7d0237a80b SHA-1: 819783413c7c57b688e5f2eca58035636d0ba972 SHA-256: ac976cdd9c0a2ea95292348404e9d8dc0aa41ab8abf9738d2454d43a0a3784a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be part of a link farm or hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to drive traffic to these sites, potentially for credential harvesting or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=warriors+shattered+sky+pdf+free PDF link annotation
    • https://lmcmanager.com/ckfinder/userfiles/files/dewipixozisebizezam.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021092216021784.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/vupiva.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27775246310.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161484f9cee319---21320401285.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/9330139815.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/39526624321.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/14671214893.pdfIn PDF document text
    • https://cubic.is/userfiles/file/21695955913.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210907_223837.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/194f5218d0bb9568fde6a1e0db1365db/tuketonapomegov.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/12899723723.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/99677508728.pdfIn PDF document text
    • https://atlantidegattico.it/file/gurumuminulidonexajar.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/9956792750.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fd3c3a828---wubatakiji.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/89053784800.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/37904760736.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fofesawelali.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/kebisupefazonopo.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/wugixopolesisojobalelorem.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/tudiwuxibeda.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161453973177be---27475173052.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_off0000bf06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF06 10644 bytes
SHA-256: eecb6e9e9fb79cf7cd79501377b89e43628d5ae491d4ac06132f153034c18827
font_01_sfnt_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 19260 bytes
SHA-256: dd4a66a6bac7aa8d0454393cd815750cd56ffe125809280f0ad0f4a78108c9c2

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