Malicious PDF — malware analysis report

Static analysis result for SHA-256 819a6bab9ff2b8b0…

MALICIOUS

PDF

98.0 KB Created: 2021-06-30 17:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68969c050f31b3c86811eb2aaff791ee SHA-1: 4690ef600f5b0926cfde9d7296b67b190ea14a58 SHA-256: 819a6bab9ff2b8b091cedb13c92e0d422ce5877e94e28dfc6ffdef8cc1e0ccb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://coretry.ru/uplcv?utm_term=wow+classic+priest+talent+guide
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba8fa920e7---59187470640.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4eb75244---70606223277.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/698a4502847baebfa3bfa5818289c3f1/xagarikadixozi.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/79604236e46ec5b3161a201aff01b84e/busesomumasajogonunafofep.pdf
    • https://juvelyrikoscentras.lt/Files/file/lerowibakonona.pdf
    • http://allaboutdowney.com/userimages/taruwulijitutofonexo.pdf
    • http://shinex-auto.com/userfiles/file/viwapesir.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779a7a68fac---28482591497.pdf
    • http://portalcom-b2b.es/img/user///file/_0626912001621874721.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcbdcd32c9---miniguj.pdf
    • http://vdtonline.vn/static/uploads/editor/files/tiwizebizamuzerajovafonur.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac7bd7f58---wowatezun.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/a5e594ee8a072f69a797c18c9249a89a/vuremate.pdf
    • http://ackerviewguesthouse.com/userfiles/file/3312683579.pdf
    • http://imssp.by/data/images/fxeditor/file/zamomote.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092d1a1d6f36---80685738707.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d48077479---25845427000.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/3ead4622a6ad469836701a1d8ad39d24/53629675809.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160876948464d4---tuwonanaremadupixe.pdf
    • https://mattress-leader.com/media/vexise.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/03a241fb663fdb7f048fb9fe81f5989b/kujipowojowa.pdf
    • https://yildizwebpaket.com/calisma2/files/uploads/bibalomewafajoj.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f7020d2b---wudatazinina.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc7f09ce29---26480447013.pdf
    • https://amrapalispot.com/userfiles/file/dapegoxilizagivelowezep.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/oi36ofqn50pefpkkrmqlh852rl/fawatabora.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bcf.bin
6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 1692 bytes
font_01_sfnt_off000113d8.bin
80afbf496535b810553d3b82975ce5fb7c79e71e8f3432e30657bda70382d758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 10868 bytes
font_02_sfnt_off00012cee.bin
8a6f4e40d3262815778e1e79d7fb9b27f25b509873ab263ee69bf213a1692736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEE 20352 bytes
font_03_sfnt_off00016210.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16210 16792 bytes

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