Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d58faaf08409815…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 13:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 09d9b97ff4e935a6f28e8204375771d7 SHA-1: 38ee8c61199e2109e54bfd6744e7617d1225f92c SHA-256: 6d58faaf08409815d8222ccd4b416c80daa193a4343d8c13ebe4c46c90d22ebd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kusistoconstruction.com/userfiles/file/soviliwola.pdf In PDF document text
    • https://ifbscalidad.eus/files/galeria/files/6710990459.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/52918750817.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/58766806265.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/takugusitasokugifot.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/pagipeliluxo.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/vademokubodafij.pdfIn PDF document text
    • https://bdata.vn/upload/files/52676696881.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6fa8757d---96129666609.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c3fceb268b4a0457dafa058491835a73/bevufifoxomalo.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/55943704349.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/15140173208.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138bae1f3dc5---sefunukepatelu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q28n5hn7lodhqet6mgreh0mjo3/1388724051.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/jalujukike.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/17/jeregud.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630905785.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac2e2d916f---tuwusuzederawe.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10d0b9a7b---jikojowawo.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/rojurodu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/dc07d1b7be39e195dc1edc8ea0404079/kunevugirarerid.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/53354129928.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/85816697707.pdfIn PDF document text
    • https://cian.hr/userfiles/file/gobabimalitekevolixajas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=shrek+anthem+roblox+idPDF 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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 17332 bytes
SHA-256: cd6b574807a98b5c7bf3038f9a41bada630e4450bc2bf555e1a69c2ea4842001
font_01_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 10752 bytes
SHA-256: 6fea57657f3d0247e6414477d7cc8137e82fb1eb2fd8a56e89beb73a673767a2
font_02_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1