Malicious PDF — malware analysis report

Static analysis result for SHA-256 4606cb0c6ed0f3b1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 02:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 558e4483c907de85735e0e3b58f4de52 SHA-1: ba063e59d4592da56f30ee165e10b05b3ef0df98 SHA-256: 4606cb0c6ed0f3b17e4fec3481afe4fae2090031c72ce54a8ebf1b4ce11c9653
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve as a landing page for further exploitation. The presence of numerous links to external resources, including those on compromised CMS uploads, suggests a link farm designed to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ciskmv.com/css/file/51402619886.pdf In PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/cf276ac0921e53ffcb08b7f3e4deae49/52097443732.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/12671515833.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/wubufazidafufunipilu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16094946f7505a---46900876787.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/jipifukoxawovorefagok.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/mesufajatulunog.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/xuxulolazorone.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/81485049099.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/23662940743.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160784acd3b1b4---gexeruzukezinuzutawosap.pdfIn PDF document text
    • http://mav-auto.ru/images/file/70031985495.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddeea264483---napajis.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/23f8fb6cc0ac4f22a051974f379ac129/67154692023.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610caf9dd2922---62643776296.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/56934cc6368ffabee211004f908a1d9d/sederixagukegikuzamub.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c4ippi7f4m9kjtappjhoephm31/86443094232.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/nsjnv7jqkpfqa9p82q80ipe8k9/30818414697.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5nrll2mag912lg7me6g79fru75/56198444725.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/1687048419.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0e5e48d58---19281282172.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/11879087816.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/54156492170.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/546a80f5d95c4ac8ec967c2021b73bbb/95613064695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=matrix+algebra+worksheet+pdfPDF 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_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 17672 bytes
SHA-256: c4a62f27d19c76ddff1942679fe7b5c8af5e45137338221de8733ab5b3eb3a5d
font_01_sfnt_off00010520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 11088 bytes
SHA-256: d78636e34978685f46f4353595668cb105d1253458b2b935e82d043e1f070c46

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