Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5d3b50e0da234a…

MALICIOUS

PDF

178.2 KB Created: 2021-08-17 22:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3bb055102549396d2a49fa7f63a13860 SHA-1: 641a3939233ebe10c76b64a2be8779715b928c10 SHA-256: 2f5d3b50e0da234aa93c12feb5ed29aee998b6d746aa9338c7cea839a7dae766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9699

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 http://natpuedu.in/userfiles/file/83462240060.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be92e7b7fef---82083147211.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16102ce30ea132---4820404240.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/15660399228.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f5760c55---98231866404.pdfIn PDF document text
    • http://lblussana.it/images/file/tojapixabilasamof.pdfIn PDF document text
    • http://emeat.ru/var/files/1038431969.pdfIn PDF document text
    • https://iohrp.org/f_files/files/8237483863.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/goduzegivibexat.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/mejunovukadefufetu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb3d508b0---83416576444.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/dewadabenep.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/c6eccd8300768b336c0c66cf80b4f867/53423723019.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/vigakozakepo.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/t9dnu28k0qt5akkm5dq2boh8a6/97930884682.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/65816852738.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3bbf74295---puloginizidaxafudugit.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/dimojusukubikijedipejit.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/widudavezasikexar.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/zajifekadusizalorema.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/46434d92e060f9637d2538265b35cae8/95387002618.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e0c940c2a---fupijarozuribosumasenozur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+does+a+cbt+treatment+plan+look+likePDF 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_off000256d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x256D6 11004 bytes
SHA-256: c6f50fe1bf1ee75fa896239b886f5a33a33ef59a889c0c22a9a9916de16bfb88
font_01_sfnt_off00026ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26FF8 18996 bytes
SHA-256: 4bbc8dca8e0fb65a9a880d1cce221c7f3eaeec41f8fe6b35dadf6e129307a790
font_02_sfnt_off0002a14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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