Malicious PDF — malware analysis report

Static analysis result for SHA-256 3198d8859910439e…

MALICIOUS

PDF

100.1 KB Created: 2021-06-24 19:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6c9f8cf72eeebaacad39f2eaadbabcc9 SHA-1: 765297a7d3d8cbd6386bfd870395b51378228f1f SHA-256: 3198d8859910439eccf44476aa04d9329843977194a6285547f38e4862abd156
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cd93273bb8f0fde2da2fce78ec342b32/lawamupekoluleburaso.pdf In PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/79722544753.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/5qfveargtqhqar5biqg7l22qu1/refaranemejagodinasab.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/36962211421.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/ecbc17e61f497df9a1af7561698055c5/45265157868.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607809af56585---pofaluwa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/j0gr40jlk3jr6vltkrij6mgt83/97013085532.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/25562541905.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915c490345e---nusewalexufisaribuwuwula.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/41346459669.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/s2afgsa5pa0rnjqf8tb9hsll0o/18873906842.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c80c1a3142---jafagopo.pdfIn PDF document text
    • http://elitvorota.ru/f/file/48509822793.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608192646aa0b---xizunawifode.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8303bf836---55788018031.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/64mlm1cjji238fea473alol60d/lokuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+rig+veda+translationPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A10 5100 bytes
SHA-256: aeae154738800284692f8df7b1d6a394d14a13aff3fc62d3c83256b20e1f8625
font_01_sfnt_off00014b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B81 13604 bytes
SHA-256: 639e922a5e6636606b7a90ffcc184620e9ff5151d2d06fb806d321dcd2aad211
font_02_sfnt_off00017513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17513 3584 bytes
SHA-256: 97ed6d9ed157dfb1ffa8cdb352f6e91f0c87cac859b8ac8b677816828962cae7