Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b95c2b52125adce…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 09:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d86fc48f0d12b56d43b54e61b90608b6 SHA-1: fb4684600c8a699bf7016833aceec5458d4ef67b SHA-256: 9b95c2b52125adce701aad535a4d1089d6f0f54d87c940a7e159753681f4a8c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=gta+5+apk+and+data
    • http://space-edge.com/upload/files/vimofokelazoreluwuzobejad.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f51299ff4---85469891530.pdf
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/21107163608.pdf
    • http://riccaassociati.eu/userfiles/files/vixerisaziwirek.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/46840838871.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e2329744ca827c35bae6202752e57c18/misim.pdf
    • http://pickup-ws.com/userfiles/files/72197107911.pdf
    • http://lachambredechos.com/userfiles/file/34746421078.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/zonawoporobes.pdf
    • http://chornakorn-packing.com/ckfinder/userfiles/files/batoniju.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486ab9169ea---81483333936.pdf
    • http://sicilalluminio.it/userfiles/files/79491800262.pdf
    • https://it-remarketing.pl/app/webroot/media/files/20545383027.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137670ade09a---21640689406.pdf
    • http://ogledalata.bg/uploads/pages/files/nafotesopiruro.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/14ef327d702abbdf3efe23cc9533abfd/roxujudedemobemod.pdf
    • http://lavalnerina.it/userfiles/file/buxixevirifog.pdf
    • http://gachmenminhchien.com/media/ftp/file/45170318256.pdf
    • http://grupophi.es/uploads/files/xavukiged.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613237327d10b---ratekumunutesebijisuj.pdf
    • http://union.travel/ckfinder/userfiles/files/49096939161.pdf
    • https://neurondevelopment.org/userfiles/file/47928231508.pdf
    • http://salman-group.com/userfiles/file/65514254479.pdf
    • https://online-wums.com/files/files/11156572389.pdf
    • http://mariopresto.pl/userfiles/file/kagovibezofavese.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 16792 bytes
font_01_sfnt_off0000cc00.bin
8ce19a4fb7f3382d500e2872b7ea7b061a000942166acaad9146f777ad5eae0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 14656 bytes
font_02_sfnt_off0000f0ad.bin
ef42b66f9abd0ee26020551f678ca54bfd60212d377927a6426fd0bf04772c22
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 9992 bytes