Malicious PDF — malware analysis report

Static analysis result for SHA-256 976a498da0605cb8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 06:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e68b37fdfbfab85528fb1be17fcf5db0 SHA-1: a6898ad27a30f504a4d5afaaa624d7e781c483c9 SHA-256: 976a498da0605cb8da5693683745d64e3632689b8b86430c786f20c62ce60d2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://oniceh.ru/uplcv?utm_term=colon+and+semicolon+worksheet+pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f930160a2---26972260270.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16104644877381---pofuloperepekexaxasorikan.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/pdnov4liirjcdpftgl221i98m2/vupupoxedapirinov.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/di4g3chh8iqbr6n8srqt4d4m05/lakimogurofavir.pdf
    • http://byty-pardubice.eu/UserFiles/File/20740467145.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1b672453c3c60518c5c27e0de60d7491/tipenalulufakumagafenam.pdf
    • http://chinhsuasolieu.com/media/files/fogirobituvagejaxi.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd04cf1dd---58089650974.pdf
    • http://asbazainville.org/userfiles/file/71280569219.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ec1b7dc80---36244525205.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/64410575160.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797db452b2---3608623872.pdf
    • http://aceonlinementors.com/userfiles/file/rilipajikenirebumim.pdf
    • https://majorsagilekvaros.hu/uploads/file/16472814301.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/47127778091.pdf
    • http://shiksha24.com/userfiles/files/64343212158.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/zebedasizipirajaf.pdf
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38319249380.pdf
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/59092212589.pdf
    • http://baheth24aqari.com/ckfinder/userfiles/files/tafidizewituvogewi.pdf
    • http://madang.eu/f_pds/fck/file/fazopinoj.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/oem78osnkmf864fg0444ms4apl/43987888390.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/0sc333au545foo0msfj4a906oh/taduzegosuxugawamela.pdf
    • https://protrialse.eu/files/files/85897291804.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1c1b93f4c7f804c30ab99a1ef0088b0b/kurujubalaxaduxenowav.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_off0000da22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 16792 bytes
font_01_sfnt_off0000f234.bin
376787341826ff75b24d793d2cdd8c6ea0c09b8341e003da2e93e67868af92e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 17552 bytes
font_02_sfnt_off00012006.bin
de269a3bb8d8644548fdf3ecfd88c87999965dccfbd261e92045ec6c6a7ce775
pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 11096 bytes