Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5933268f4b9b16b…

MALICIOUS

PDF

87.4 KB Created: 2021-10-05 11:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6e6890f8037f0ee438eff17d89c5730e SHA-1: 0770950c87f57feaeca283dbfdc9b9f70e4db0a4 SHA-256: c5933268f4b9b16bd6988918e52397ad90888612323a41aedbc0cedc96bc51b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to PDF files hosted on compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents. No scripts were extracted, but the structure itself is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=the+process+of+academic+writing PDF link annotation
    • http://i-p-p-c.com/ckfinder/userfiles/files/duraminaxel.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/dezodofubuludezijivor.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/koxomitowubomabunawijasaz.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/7210908257.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/ralotapazizepojo.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/43752485288.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614598a0a86ab---tiwepokulufoburadegolos.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/xokagosubalitadusuxiroviv.pdfIn PDF document text
    • http://dostavka.markasib.ru/ckfinder/userfiles/files/24839296159.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/lovonep.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021092418225373499.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/78792983985.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b7c8d89c7---78346826219.pdfIn PDF document text
    • http://opsir.eu/files/file/nitugolole.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/398674186.pdfIn PDF document text
    • http://rrarental.org/upload/file/kobiremusasimi.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/lomurosoxi.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/18261495641.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/84723145549.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/pipogekuzolivafaburi.pdfIn PDF document text
    • https://krossi.ru/images/content/files/rokepidelexemipusokul.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/32828802545.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3d5ac9c9---ranogowalamawawaba.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20211002224849.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_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 19912 bytes
SHA-256: 1012c98da353fdfbe65418d8c335e23a53bf0ff1c955a8091d5e497a827b4e27
font_01_sfnt_off00011ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 11068 bytes
SHA-256: 7d2f1bcdd583d391d3894e38936a7481605a1742411ff18bd06c4b91d0c613eb
font_02_sfnt_off0001383f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1