Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d9c115e6ca3ede1…

MALICIOUS

PDF

88.5 KB Created: 2021-08-20 05:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a208b0f74a1f0498fadfda0955718607 SHA-1: 9a32198cbb9d1837bdbd6cfc19d4104e5bd51d3f SHA-256: 4d9c115e6ca3ede124e7cec8d6560d793fa97a3d316679ed377e8ab702e3068d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users by masquerading as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=facturacion+office+depot+pdf PDF link annotation
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8qs3k9fpefm8vfkp6la7d5oa03/towekub.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/vtopp27792tic6idohiapi069s/15979023937.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2ce97059c7e054baa164782503293005/makemuwimoxopeperexoloza.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/71786262080.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/wadaxibinozomef.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ce8b3e884---5054173824.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/f1bjtqdnhs2m41tg7jgv3ve2k9/gakimowunetominozemitiwij.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/s7sdknmg5n0jdhicfq0aee8o64/zegudojitonovekotalez.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857dd983f47---91172375776.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/famepovola.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5ad2pvmf7j2c6mshgo5jeoavqh/54293380418.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882fd85648---20494616315.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/tudakelemajaxoketizulijo.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/fimorebitupadibeda.pdfIn PDF document text
    • https://ebooksweb.net/files/file/55420426359.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/bexobarigopudipomubotoz.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/pobipagosigiwo.pdfIn PDF document text
    • http://martonelektro.hu/files/file/27126256262.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b2bd96e8---97128152624.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/67449714852.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/tewoz.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/gibob.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/33785235140.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/panudesapube.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/virijezakawuzerafejavape.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 17280 bytes
SHA-256: 600357b8f39f4639860d03cb04968070dd94f580d210778704af23971b8dab22
font_02_sfnt_off00012247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12247 16892 bytes
SHA-256: 7bb558c053dc4e043e6ec2b99395c9865f054a5c24d8cc6c1cc1224a35179b35
font_03_sfnt_off00013a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 10476 bytes
SHA-256: 92e7c8ca68ba57ef5ee837346f66902cfe6af960a1e646fe9702b4bd79b8371c

Open this report in the interactive analyzer, or submit your own file for analysis.