Malicious PDF — malware analysis report

Static analysis result for SHA-256 787219097eb08d42…

MALICIOUS

PDF

84.5 KB Created: 2021-07-14 05:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e70749e810138e4c30f73bba9a657d95 SHA-1: bd06f0a95a06329a188af7d6e323bd31b77fe8c9 SHA-256: 787219097eb08d42c0dbe02a4153c8bdae6fda9da0ffbfa054f457cc13d9fffe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/uplcv?utm_term=hollow+casting+process PDF link annotation
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/c449f0d25c3e47c62cc9334535e711d2/nasitokexizaxoseza.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/24874710356.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf686fbecdb---nukonubelupidasoviwi.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/70409303571.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-1/20210601085526337619.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ust6mm58rs1a0el1lognvp55r5/vejudorivivuzazoxura.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608d07108e81f---59618467429.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3c3b84693---19395207182.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/kosujupusupexopepalil.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/73f5773a7eb4038aaacafb877ce59e6a/pepunujowebikanizavudu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/im6kpd3vpao8pl00j2u7c6dmu1/wabososid.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/33933678939.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b5947183b5ce5d6aa21790cee9396cac/busetomapobadifobogusepe.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4762ba94a---xomawolifitaw.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/rebeguxikoresofotolag.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4f0caf1bb0b8e57f8c41443993f36c6a/daputemokidoremokitagebap.pdfIn PDF document text
    • https://uangraja.com/contents//files/geketum.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/10805419534.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/ratiper.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071460132b64---mewakuxus.pdfIn PDF document text
    • 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_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB8 10628 bytes
SHA-256: 1d99ad52b81621f4f6ac4ac7914764101359aa76746d093c306df00bfb4b6c5a
font_02_sfnt_off0001162b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 18076 bytes
SHA-256: 9ea6c3620fed2153ebff85f188f1cb0193850b7d21169d40c10caacd30a44ef5

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