Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6fa15f263d9031…

MALICIOUS

PDF

77.2 KB Created: 2021-09-30 10:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6356dfa8dd9d39ed644068d756611ec SHA-1: 6ebbbc3522afa34fda26aa6c095e323e49adbdd5 SHA-256: 9a6fa15f263d90318c6e3f3699ea29d4c0a51747fbcbc6ab84ac1c184ef8ab0a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=rush+rally+3+apk+download+original PDF link annotation
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/21823611358.pdfIn PDF document text
    • http://placc.info/up_image/vafobidezomigelojerulixiv.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210927054940.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613504ee77c2d---73534247919.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/28816787591.pdfIn PDF document text
    • https://iword.de/userfiles/file/vubebixave.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aca33311b4---57886123240.pdfIn PDF document text
    • http://runhouchem.com/upload/files/fibivu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16153251a7b51b---warodosesupokago.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16147050258967---borebiparuf.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/19592640555.pdfIn PDF document text
    • http://email-database.info/userfiles/file/67506398809.pdfIn PDF document text
    • http://szpk.hu/_user/file/43577485885.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/maminododeb.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/98131938638.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/51607916702.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/68988001996.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/ruvemukoso.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/bejuropogedob.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210925201307.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161408845f41af---mupasuzunibuful.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/59282705185.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/lenupaxigideberevubumulax.pdfIn PDF document text
    • http://standardamulet.com/files/files/xakeraroxuridufipegat.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_off0000bff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF2 11048 bytes
SHA-256: ed5fcdc28eafb4de8df3f07ee2e901eec73f63cad47a054ec26580060052d51f
font_01_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 20256 bytes
SHA-256: 977b12e0cf1e9719fcee54b4bb171fd3abb4671b4856d6aea4209fb7e5429eea
font_02_sfnt_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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