Malicious PDF — malware analysis report

Static analysis result for SHA-256 be82ccd49255b4eb…

MALICIOUS

PDF

105.7 KB Created: 2021-08-14 15:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5853ee298dc1483a4fbc1eb8638c1c9a SHA-1: 0e34863565e1354b2523bc7fbeaebf1614072a29 SHA-256: be82ccd49255b4eb185e43dde5675634ff867c231cff7292521661617ca10148
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://zoorichi.com/temp/fckeditor/file/wujutewukuwavozisasi.pdf In PDF document text
    • http://kochamsushi.pl/UserFiles/file/safigumutudadufuwepas.pdfIn PDF document text
    • http://groupkaishan.com/d/files/11769223563.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1d800b76e61210f26700744c8492fee6/80259159951.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/zufegitodifoveder.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/14b0f9cddea55139ec197a6f5db837de/58458558355.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8e94975cf---lokixoxegibajulonosuxeto.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088559ea6e14---burerutixaf.pdfIn PDF document text
    • https://12waktu.com/contents//files/91099983081.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/vovuguxexonil.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/lpv2uthnfakucgqtkmmi2busce/vigakexularemo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/add363ed81409b97065ad9463ec65497/luzasajobiretebonetif.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/lru1rjdpcvtsv1piqkss28m213/penizelizusab.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/18000425487.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/99347841891.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5e13f360---xanaveremexiputaned.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/63662480787.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7dcdc6c1e---59744977676.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/90140911331.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7s3nv609rgnuljsr47nucsbfm9/mosajesaxi.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/rezuveda.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0ef91fd2---gobetumorubawifoxexu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889e35e1f83---kuzupuwigof.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/95099579907.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ac9b561aa5517e489d88905ac9e44d1f/vogufegafiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+adventures+of+ibn+battuta+pdfPDF 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_off00013778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 19672 bytes
SHA-256: 26c0f8133dc0a4cd79b818a127646a8deab36d6170a8e4b331bdb841e1418a59
font_01_sfnt_off0001690a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1690A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18121 10820 bytes
SHA-256: b6d13574a14d7b84ebc75c9dfdc547f6f885ec092a8af2ea11448645f080c381