Malicious PDF — malware analysis report

Static analysis result for SHA-256 e07c55c8345a578c…

MALICIOUS

PDF

72.2 KB Created: 2021-06-11 18:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2b697d63ac78377f520f162c752cf56b SHA-1: 7e8557ad40f18b7c98293eacd157c3caddd0942e SHA-256: e07c55c8345a578cc0aebed69fff0d35c67932fa9188eb660242c3893708d94f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document, identified as malicious by ClamAV and an ML classifier, contains numerous embedded links. These links are presented as part of a lure related to a 'Bella chao chao ringtone' and point to various compromised WordPress sites and other disposable hosting. The primary function appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=bella+chao+chao+ringtone PDF link annotation
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa137848090---70634472445.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a56d0fee32822dc1d21b84e69882a370/96703235067.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f1adb877c7a502bdbca5403a7b774a6d/54967580072.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/88053547123.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d7c214cedd7a9caec40afcba8e03d169/vajokazejuripofuj.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d029110954---2659628752.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e8975cb7---mojewanudijivogakizax.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae03bb31b15---wekudifanulasix.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/91b2c4b0ce6702870d5ef802f5082d75/butagipeletitojipid.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/wasujojokorozebulufupofix.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb850ae19f---kadenafoxovuvowaga.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/qb7ok8rnloug5v93dik1rab706/pezutekubizefotewus.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tejnfk5g0pbfjieavji54fs3k6/48645728978.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2005b8f3b6---99231410428.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/dodevuwet.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/somubupetivitenu.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/23039574003.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076a9d9399f2---nutotoserepezoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 4932 bytes
SHA-256: 65d52f72e70b284eef385c91e6a5834f7f64b6789fb166c34eb20d31528ab4b9
font_01_sfnt_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 15396 bytes
SHA-256: 7e48a623eedc891de31614b24c534d0122e35715208f09d982b6be266b231098