Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03d2d54d02002d9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 21:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9f6673bc14cd8ab4ae64a6ade43d6d43 SHA-1: 19babfe504b8c4cf309debc30e9cb66e4f02b19d SHA-256: c03d2d54d02002d9c581ae4a0ddff9528dc5a15b62cd501c80c77313fc9f6513
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://nbkhjc.com/uploads/202107/file/210722025809876350erphmnjz0j8o.pdf In PDF document text
    • http://fobas.cz/userfiles/file/62956176221.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/47930269826.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608416243a6e4---difatofobukutetobe.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/2751176336.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16076d9daf04c1---litejunidopiwiraruwu.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/84269796216.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/lowepusogapofawu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9660d9315---91040652104.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/54164762237.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/40736925498.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/zifobamerinubolivapenije.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/43146433592.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/muxebepidenekegakuf.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/16069888195.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2f62d472aaaca21ae775624b96253523/38399638960.pdfIn PDF document text
    • https://campermagazine.tv/public/file/46430304384.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/gabamixuribu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dc40441aff9---2001610338.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/tedafig.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/totegenarifemenidana.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611a658f990df---66427276699.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e3c6b6d84f624fbddd4ffa73ae477b8c/88296924717.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/16437492132.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/kizarisulekoniwokimuluvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=doctrine+and+covenants+77PDF link annotation
    • 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_off0000deff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFF 10432 bytes
SHA-256: 377bd2d8c0fcea8c48ffd53974fb0361af8b78794117496bff724a44600bc7c9
font_01_sfnt_off0000f6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 18396 bytes
SHA-256: ecd716952bc378f1fff5b0e5ec7668eab6d0518cb23b35b1cfe6b386753367f7
font_02_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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