Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0fd8ab00e102937…

MALICIOUS

PDF

94.4 KB Created: 2021-07-20 02:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eae908aa43029da29f5b94dc2250dc12 SHA-1: f8c761203f77a5ee740244892a30fd4eaaf4ac69 SHA-256: c0fd8ab00e1029372711bb46355f7d84524fe0bd39bcf80ddbb9d4f0c408ceb3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://studiosimonepantaleo.it/userfiles/files/52725394975.pdf In PDF document text
    • https://alarrabnews.com/images/content/content/file/wagixusowixegatudadujuwid.pdfIn PDF document text
    • https://cristalensi.com/public/File/40253638276.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eefe5a2e6c---88562568831.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/75522245536.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/833a96ad08e36181c3b97745b777b3c0/85755029538.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed4b721450c---83106004399.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/cc10dc528a5a2ece0d5ee8720cf67cd3/pemegofujebivo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a796f2c30c---rezuvesusugizapemoluda.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/74787317036.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/27216930450.pdfIn PDF document text
    • http://calhi1974.com/clients/46234/File/78413961703.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e551bc1cdb---43932167192.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/38242111498.pdfIn PDF document text
    • http://mesterek.net/tmp/4381992886.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/1psdjo51es5glu1ivdnpj5l794/vanonizaket.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/4074798762.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/96029055482.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a191bacb73f---36127770316.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/88c29363a8bae9722cd381e73f128e5a/dunawupevubezumo.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/15727932773.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/ec15f39dc8e2f6e0777bbe0a7a9a379d/37373278956.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/15478847953.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6f029cc3154f7a1b041f88d6a78717b4/45632048702.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/msfllsouomlbmsp4kmu2g9r10d/xizegigiruxevumuje.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/pilelurimob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=english+voice+acting+in+japanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 10732 bytes
SHA-256: c61476421157ac7c3e3fc69bd4ed1f4e7729eb4f3cc16152042d193709d06b69
font_01_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 16920 bytes
SHA-256: f3f5a4a6b96f50940e35ee5af287b5c6954d6f4c81f72aaabe4b15d963522a8f
font_02_sfnt_off000146bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BF 3156 bytes
SHA-256: fc58a7a1800b9843f3ac811d072f76a21d3f77dac878d45e52d8d5cb473c840b
font_03_sfnt_off000153d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1