Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e58e7d11e135c0b…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 11:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 981a6d6f261eade4a51e078d622985a8 SHA-1: 14f1fd0a013a0dd804db2a59f17fe4eec6b4fba3 SHA-256: 1e58e7d11e135c0b1a23146a48e7a25742790a3debb497e39363d026b9d1be6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of malicious content, including embedded JavaScript and numerous external links. The heuristics indicate that the PDF is part of a link farm, with many links pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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 https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/704q8hogc4ooe2pb4bl0gt5hq1/faxebowakinexepi.pdf In PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/49433204565.pdfIn PDF document text
    • https://nevisnews.com/userfiles/siviwukebawelasagojuvepe.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607010b1b489e---53306281887.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/fiwowubevidevikureni.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/92243859305.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/27502289867.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36ca554497---7386306198.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/99933364111.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16070230fc49d4---zejoregugobudivu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/07d5a8b17792bb8198c6829c3b488e3c/85586948702.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/66789080878.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a77c25849d5---govunizajuzifozujupo.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/43724642150.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/mccsrucqrqp8d6089ilnr7ntv1/dexemopedesujutugidizevu.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/34320581825.pdfIn PDF document text
    • https://turbooto.vn/upload/files/46939045254.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/8729349322.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/08f2293b03a00ec621e034950c115d6e/safesagulupefaro.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/90aff1603e994a25451962844dba5941/jijelijisufazida.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/03e301a135383defccc1d8b89fa3e597/35966260424.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45264139bb---gigaveso.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ac412b29c32---bisujizotuvol.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b28be23748b---22998873097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kamasutra+book+summary+in+malayalam+with+pictures+pdfPDF 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_off0000f19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19E 11408 bytes
SHA-256: 4160958c959a4b6a9630ec57fee18b37c4e844688201314d142254b0d851a29e
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 17236 bytes
SHA-256: 2e8074ec82d1f90ce7fbeb38090a29f5ba1393553c99f5c9d1ac31d297447654
font_02_sfnt_off00013933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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