Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf7de26d65bfc6c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 03:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: ae5a8bc1b62e1161b591f50c4d088344 SHA-1: f7c139fc73b9b2680b356ae5c53d040a31244810 SHA-256: 7cf7de26d65bfc6cd1298eec6dce1688830ac6e85ff9e74203d39283977e007c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript (T1059.007) further supports the potential for malicious actions within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hzbmsj.com/images/upload/File/90134262852.pdf In PDF document text
    • http://zehanbiopharma.com/upload/files/90332233723.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/lotazulepamawaradu.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20216271643197018.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/lokaniwabifuduxuzewi.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/misogof.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/guzipipujelag.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/84787236608.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7de15961---73995822265.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/sifuvifinutomi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161139739d23bb---44681749968.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/64011984330.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/45767345897.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/62159478748.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/wunoz.pdfIn PDF document text
    • http://goref.ru/files/file/88993609659.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/jufajobinawipagoxegisuxo.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/0fe6ac5cc6943f9addfc410ff639620c/penekasiwagerukikud.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/55820246638.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1a7882c2d---24266203187.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/75611696776.pdfIn PDF document text
    • http://marymo.ru/uploads/files/6258699372.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/sebov.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a30ed98a2b0---kuvizeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=make+pdf+searchable+adobe+proPDF 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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 10648 bytes
SHA-256: 8386c71e728e0a257fdfcb49e5a8c4b71f2cb45ffa2d73aaf1f130d6b6356d69
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 17880 bytes
SHA-256: 8e6dc7e323cfff8b84a34f5050eab2fe3c703a4c0fcce8b6107b77b35a974e9b

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