Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8efb9cf9762d8a1…

MALICIOUS

PDF

88.8 KB Created: 2021-07-27 16:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7fd05b65a8d06e67ec2499671bb7fecf SHA-1: 0284ed36a03dad942c92de4bb2d9e5e35061da5e SHA-256: d8efb9cf9762d8a190eb6a415a4517070720b9eb6fd2885ef01b98e1daee319d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates it's a social engineering attack designed to trick users into running commands, likely to download and execute a second-stage payload. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the heuristics point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://ashioke.com/images/library/File/91359785270.pdf In PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8edab3982---31372516161.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/menisoxapipoxixizigemebi.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/zagix.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd8a48947---48742781110.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fddf392b07---vokajen.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/82752088816.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/85527385372.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/16682353609.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/59619e9296908dd053592fb959da4654/34028323731.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/64090587283.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160814cf9c78ea---94683819035.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/nne8ef3koiuekbab7u1kpbsvun/medugulizizuzi.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d84fe7206784e6ac291dd694bcdc350e/tanitarulazuluvikila.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de34b874f4---waxerepeposugof.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/60436831466.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41d527bfeb---54410090699.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/aaafb33a4866ce98c238070d0d047d33/30600606097.pdfIn PDF document text
    • https://unosms.us/userfiles/file/47797365394.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3dca07cca---6157557952.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbffda49ada---tijurekixevirobep.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2950169c0---83190257868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=synaptics+touchpad+driver+acer+aspirePDF link annotation
    • 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_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E40 17228 bytes
SHA-256: 721ec5a3bc0ef3bc3470224c084d2e049c2aba048980f0ce683be2001e527fda
font_02_sfnt_off00013b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B91 10920 bytes
SHA-256: 5bcbc7753a9c4cac9d625dfa55442330deb63f482bade50f86a8a79fb769a949

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