Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6203ea65b1880a…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 23:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e367ade7d824ae3e74f2c79eb3c53af SHA-1: 9f71865e825970bb57761ee42b3451e31d34e946 SHA-256: ce6203ea65b1880ad36d0169f3f9f276a82ee57eda5a3a1fb1eb72d4ab391212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to leverage search engine optimization and compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://allytemp.ru/uplcv?utm_term=android+9+easter+egg PDF link annotation
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/vugiwaxumapedanero.pdfIn PDF document text
    • http://bienbao.org/uploads/files/ladorik.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/50396228724.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614567ddc4dd9---xarirufujonatozogafekugag.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/42286499752.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/norevijafalaf.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/mezemaduxeviwopugen.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/samusidofifetijijuguzesa.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/59631350697.pdfIn PDF document text
    • http://superazs.ru/images/news/file/sekotatogusajifoxuto.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/somile.pdfIn PDF document text
    • https://virker-ikke.dk/files/tafase.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/fuletejirawuxosa.pdfIn PDF document text
    • http://nemalipics.com/26114781910.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/89444228646.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/tulosomomev.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc53d6d4a---xejuzolekoxuberumineruna.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/xodaxowozafodivawavedu.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/bisafibuwenukarokutepun.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/jawanokufukuxikum.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/24160123767.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/48175161421.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f7f39e8950b1e8adbf54e593966ee395/nezorew.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/zuredegi.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/15783521159.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_off0000b4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 10528 bytes
SHA-256: 57dc7a2b598851e22ac91a46cae174cb09dd3b8af17917bb00b09b85f1870f29
font_02_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 16956 bytes
SHA-256: 2117cd8cf46f0165cb4744f40f09518bff140782fa83cb2955b8ad7b4558906d

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