Malicious PDF — malware analysis report

Static analysis result for SHA-256 833ad9e2ab7003ff…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 18:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fc1991ae9945912f21a4dc210fc0bfc7 SHA-1: a45465c7de1e15791b13676c06250057b5db1149 SHA-256: 833ad9e2ab7003ffde9ec86b00f408c02502d0aa4a0bb0c3fc103f757cf6b864
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=bring+me+to+life+sheet+music+pdf PDF link annotation
    • http://jyjwqj.com/uploadfile/file///2021070306012470.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/xalogevuxizitet.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/75887313282.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b51498d3008da2470fdb536e76705ace/90749648592.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6cbb05c4---66935359777.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/66941465874.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/kebirurez.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/40546904550.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/debixotekatibadamu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d2bf49bb5---sojotin.pdfIn PDF document text
    • https://rjpexport.com/files/bexusesoruxosusogomik.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/kukoguzebamimasu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3dc47ee9---nuzulitekotavoselosiwunud.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/21248929800.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/nunawunilifurumab.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/71826497960.pdfIn PDF document text
    • http://darstin.com/userfiles/files/lomefet.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/samakolumixefapitagaxom.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/nuxeraxep.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161132c2203122---borixixuvepejoje.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/xurodetumarilafumu.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/sirizogo.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/korefizibifoju.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4f8c25cc9---kuwadefupaxan.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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 11056 bytes
SHA-256: f51ebb14b8ea0279eb5ee572499405def549b39c3b764c3fcbb9c9a35f9ddd79
font_01_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 17708 bytes
SHA-256: c1fb96d0f66dfd3d7bdcd03b7be9277c0a8e105c8ec2c62a5253922624a8d638
font_02_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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