Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb522ae57d76100…

MALICIOUS

PDF

90.2 KB Created: 2021-07-22 18:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4816a4889a75282f636455873b644845 SHA-1: 9542a07e051e8f6d318235753cc4016f30de5361 SHA-256: 5eb522ae57d7610082fe1b36c7ee4ae8d5354dc7933d4ffd483685e1d319b329
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external URLs hosted on compromised CMS platforms and disposable hosting. The primary purpose appears to be SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/o3k8t36d8nlqpaldf05h420k80/xonigebajelanotunege.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093c5e264655---34436445511.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/wibumax.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/99093080367.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607317253bb33---pizegejitutomoz.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/523dk81009f5tceap5jnue0bns/vonevijaw.pdfIn PDF document text
    • https://premium-house.uz/images/file/50319186630.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios//files/gexasikineju.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/pumidigoxozuduror.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/72584890252.pdfIn PDF document text
    • https://lecachet.fr/docs/files/dusivoxebagunasawunarital.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/1530674695.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/87745554478.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/dd57412006481911fa174889674aa584/nizizepen.pdfIn PDF document text
    • https://promise-land.com/upload/file/99408042767.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/virepatotiriwur.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/pizuxatimikexelopesagiwov.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c827233081---derakutabuluxo.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160709b0625819---79683803275.pdfIn PDF document text
    • https://capecoralliving.com/media/file/22161310157.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b818c75a445---84393604482.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db828ac372---63295443533.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab43d2fe7---zugakatijojikegonido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=real+time+cameras+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_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 10600 bytes
SHA-256: 6ce0843ab22a10e1db595b8de798af8c071d5d9693702405ae1c28e9917670ad
font_01_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 17400 bytes
SHA-256: eb30f1f99df23d899fbdabd16cc8fb9775ce5eef30270c4e2b872d3012c9ee47
font_02_sfnt_off00014207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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