Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a19d08572e5b448…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 06:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6bf0c16dca488c79b26ce95d0e66e2c SHA-1: fa9680bececa4e5fcfe83230b8acb8fc078fadfd SHA-256: 1a19d08572e5b4480f06e336966c70503efc3c21a431501df8d192cb6f166d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO manipulation or to host malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=advanced+materials+engineering+pdf PDF link annotation
    • https://calendarsunrooms.com/userfiles/files/sonemotonusadonalupa.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99aa03b44---7072542366.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/1601111865.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/83778336338.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/virijabawerewelari.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/piwozanifidaronavu.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcbb1216eb---49185806092.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/mewewitubujikapetalev.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e191d0d19e172c211bbe6a29b1451654/dikisumun.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d4a8efbb---todebenipuwegujavajavet.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070167f1bcd8---26250693567.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/50721228181.pdfIn PDF document text
    • https://orrizon.ru/images/file/61866972273.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe46899e2---datimovobokoribukovamavuk.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/faxobazapoperususofi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc9d803270---tukiwor.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6123ad38b50a099ccc56ba322391f185/68733478585.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/duradowadoxesamolo.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/3213400240.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e41b2bc58---xugiliraluzulorakes.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/81116916568.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/87222180632.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/23b4f677ce4d7bce67303b665ad4f35a/fupavuxo.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/2724678370.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 18360 bytes
SHA-256: 16378b786a60c03ef7e9b03bfa8e5130b13dedd79a8638ddf5e286101421a010
font_01_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 10892 bytes
SHA-256: 2abba88e94c96bc88ded9c835b8228537ab2ba91fd3c74f06673c5f0b9e1c75a
font_02_sfnt_off00013a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1