Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d5eb48e291ba9b…

MALICIOUS

PDF

92.7 KB Created: 2021-09-07 13:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1ad295c7ad91b96bc7a00feb6862f9d9 SHA-1: 6c5868a3c8132da1eb91402ffd64dd51393f3d70 SHA-256: 76d5eb48e291ba9b2693b680dc58e8b0243058714f75b46f5937315eb644efd4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbad9c60d8f---43909485922.pdf In PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/e9gvkp3iqc2a9es6pl3n0tkvj4/jakaz.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/mifasabugitete.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/bopalajitawexumexelekex.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c8681d7243bf20487837d3c47a3b286a/34392571808.pdfIn PDF document text
    • http://manu-transport.com/documents/file/fidavuzoxudigirifar.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/de08097f677bb4611d0004a33e7d8446/99237458592.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/654b883a7d2e14e611a141193b70d61c/tadag.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/576r56hm86ti6m5ldo2mf444to/sajot.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/31088010989.pdfIn PDF document text
    • http://asvpp.fr/pdf/lanazuzepifasowi.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/899033473.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/wuzabilavigilusoxu.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/8913586271.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbf5c86cf6---84842448440.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/bujademovatamifuxu.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/37ac1dcf267df8e58fae83e8110ef868/11552211506.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/numagaxetodakiluvama.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/36987975293.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/15689741763.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/ridapoperaxirup.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jifeganadodarumetovefa.pdfIn PDF document text
    • https://aildf.in/userfiles/file/2486382916.pdfIn PDF document text
    • http://12shio5.com/contents/files/17125019415.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/92756980876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=angielski+slownik+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_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 10472 bytes
SHA-256: 0184bc7dcbc6b26785e5e6c26789cc907a6f5a4d84c1675fb909198f2e3df42a
font_01_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 20600 bytes
SHA-256: 85031a49a7c9a92384301a0e199a14dc767a8610a9da43dc3ef9a3d44b708053
font_02_sfnt_off00014d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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