Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68027c1d974aaee…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 01:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d1c1296da45c27fc30043e8a5ade008 SHA-1: 2bd50ed11a43d433cdb1229eec9b9aaa5ad945ed SHA-256: c68027c1d974aaee9d81b9baf8ba2917a9c65ab0e30edbc3d0943d1e7cd3fa0f
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The heuristic PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM specifically highlights links hosted on what appears to be compromised WordPress upload storage, suggesting a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://slesnick.net/userfiles/files/19297412501.pdf In PDF document text
    • https://maconlux.lu/userfiles/files/10219859813.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/46866596730.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/wimakufakagoseveboxov.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/wuzudili.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/kumeborosale.pdfIn PDF document text
    • http://wuchem.com/upload/files/jazevirobugonoxanulidu.pdfIn PDF document text
    • http://rilta.net/userfiles/files/66089275452.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/3553322642.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/juroxe.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/45945930635.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ab5db404e---niladatav.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/tagijemubejara.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/68541433268.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/29898965257.pdfIn PDF document text
    • http://jaqalsports.com/files/file/19422759832.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/laxutipafiko.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/gusebede.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/96074081152.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/kp05j9en7duqsvroc7gc87fkfn/24132298948.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/zonivapokowitadali.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614110854b830---58723808183.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d624754b8b---tulafudafegutifid.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161376d47a4bea---kegurozodetofabamaxalip.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/libovaboveki.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144feae9fd4d---zitelibakatepajek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=latin+words+beginning+with+pPDF 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_off0000e08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08B 18224 bytes
SHA-256: 6fbb71357ce6e0b282e8145795e81d005b4ce1ca1dc164326e698a5bb91f38f3
font_01_sfnt_off00010fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA1 10808 bytes
SHA-256: f2a5b850d2cafb79bf5929518ab3c706ad7ce936580d7caebc81655a6ebeaff1
font_02_sfnt_off00012826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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