Malicious PDF — malware analysis report

Static analysis result for SHA-256 466c31ebb795e837…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 13:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75adb4c043e001e0bcb843916631764d SHA-1: 1ac542e8565d1a17e56de9b4166f52b9cebb4158 SHA-256: 466c31ebb795e837201abbd1bf3ef2d269e28db5331230294cc4ba4c095938d3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised CMS uploads. The presence of external URIs and link farm characteristics suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://wijnhuis-vaessen.nl/site/data/ws/files/83884441278.pdf In PDF document text
    • https://shindah.com/images/ckeditor_img/files/dizemov.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/91134523082.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e13540ab0---85417609171.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/zamamevexovurumopalax.pdfIn PDF document text
    • https://insp.biz/img/file/sakegawowubogiposolisolok.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/wujarafipukesafizipas.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/tuwaxe.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/80883902132.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/31634150124.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/95418172271.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4cb53fa823201c9b8f5a240f283ecc18/kavufewo.pdfIn PDF document text
    • http://airmon.hu/images/files/vuxufu.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/dikolasokavinurinased.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/12370726941.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16142ead7a904b---6293266998.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/55921325663.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/16809947284.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/zijatij.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/jonitusupapavogigux.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/17060377318.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/kaledeb.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/dapebon.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/zuwewuvesisamaresawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tentacle+locker+apk+for+android+free+downloadPDF 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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 10584 bytes
SHA-256: 76acba44450b0e24345eeb99c349c6cc7d73abf60ef8df09b893c7a81808ad4f
font_01_sfnt_off0000caa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA3 17832 bytes
SHA-256: e7f781b53da73c0f5e4985991d1d011a22d2632591e140ee10e722162cd3b211
font_02_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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