Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b843d27422e8a9…

MALICIOUS

PDF

70.6 KB Created: 2021-06-13 19:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cdf4857b855d5ea3d6e352ac07d1af23 SHA-1: 664199b8be8dbd002617e159e466207b630fc9a1 SHA-256: 48b843d27422e8a984a2bd8b3dbcd8a1c092106ad4ae3310122eaef57cfde5b2
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, many of which are hosted on disposable domains and utilize link farms. The document body, though heavily obfuscated, suggests a lure related to movie downloads ('Train to Busan'). The presence of external URIs and compromised CMS upload links indicates an attempt to redirect the user to malicious content, likely a secondary payload. ClamAV detection and ML classification strongly support its malicious nature.

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://cructi.ru/uplcv?utm_term=train+to+busan+1080p PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080504f0333b---49306599395.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/71879749206.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/1gsr9dmno8e931bi2reb0l098a/fovofupoxotug.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe3bb9e55---94335460531.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/ogliglv8gekv0koa3js4v2adca/jejojibonudalisagivil.pdfIn PDF document text
    • http://alkanboya.com/files/file/%5C/vunibotulusomelinabibiz.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff35c6ed9c---xukal.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f0fb819b9f783c3b68e625f3ed704ba9/14741191669.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080309f45384---29005579978.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/pgt0r9lsie7vl0vsoj4njfgil6/mifemapukitotapirepuf.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071850626eac---gowobusom.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/gajovosal.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/7757508867.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e45deadcbf41fbe4f6d6fd6840254741/70589081199.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/22282546143.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC940 3384 bytes
SHA-256: 14efd040478ae582e63595d8546f2bef3e838f86cb0ec09983e4f979a13476cc
font_01_sfnt_off0000d573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD573 5260 bytes
SHA-256: bc50f93847f3ddabd6b89ca23071d9a4c2b155a365640112e0d99772531f8ff1
font_02_sfnt_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 11896 bytes
SHA-256: 70ec60df5adf2eba78f3537f1eb80e13b9703fd67c17c9d4668d45b587010701