Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1a7dddf8d0ef9b…

MALICIOUS

PDF

94.6 KB Created: 2021-09-02 05:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1dfa7655d06a7f293acfec71c6892118 SHA-1: 2e86b5fe1e427cd45d7bd5861d800ad466a77207 SHA-256: 9f1a7dddf8d0ef9b31a0350405520f698738fe0820dd78f00ef4dcec1910e33d
96 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended for malicious redirection or phishing. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=rs+wiki+vindicta PDF link annotation
    • http://espicycooking.com/files/file///35473940607.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/70945305821.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f34c6463622---lemazumutobixatepovim.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/92793941797.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/sotipigujubakevufezimebi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9f374f7d6---goxudemorekiwo.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/zilupuwolabilusirusal.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gjl0e4u31jj1ae6rk02bovu8g3/nutigevodixemedogire.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/9qdp3rm1n4b0ujqarrje91nj6t/728986754.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/vizekesesaxofa.pdfIn PDF document text
    • http://splogservice.ru/content/file/fuxidakolese.pdfIn PDF document text
    • https://petala.gr/userfiles/file/4737956854.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/93453812405.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7b3e122a569a3d907f925b8ea22fe6fa/92860800634.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/14847122191.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/kevajeke.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/254206fc16b98c8a3e0866c6b697c0d8/zaxatazorenowudomudu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ea7db1b9c---79201823181.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/38169477075.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105a7edc48f2---kujowilemagijasiwujumapo.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/89a9ttjfj8qn95c13sbtgss1qa/juzekokepalugopina.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210704164208.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0c9e422b1---fopeluzanozebinuruz.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec41d97b76c---89303532891.pdfIn PDF document text
    • http://renovator.cz/files/file/rakedubawigegopuzorar.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/91125590163.pdfIn PDF document text
    • 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_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 10252 bytes
SHA-256: 6e05557f706312700db95052884a46e99c5bd86d434e70b033bd4d2ab2a14a93
font_01_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 20216 bytes
SHA-256: 441a9066e4b251f79ae9cd510f327c9b758bf447e431cbc4820610e75707ceba
font_02_sfnt_off000154ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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