Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8a8e8a5162a3e3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 00:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 370433ffccf02b85d93a87876c9d3db7 SHA-1: c92e5670d0b0ac3a1b8d224caf9dc2967f5a173a SHA-256: 2f8a8e8a5162a3e33b4d7e0805c1a62762d0b6330a9d517cbfce837c406a3706
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The presence of numerous links to compromised WordPress sites and disposable hosting, coupled with a high ML classifier score and ClamAV detection, strongly indicates a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xz-brand.com/ckfinder/userfiles/files/kutigefibofezulemev.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1b686d4dd4fab9aade4d73d7d75b0792/91413654132.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16103ae636ad2c---58768069909.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606d817f5fbf3---71914168230.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/27554971895.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/furasawodeworatow.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/759cce873e3852fa1ba398a52497584f/kaxovilukuzamagotero.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9bef85922---37701465794.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/71820727915.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/zogifelizasa.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f76f058dffd---57960593087.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210904045326.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/18841779998.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/nokenaxanilofofejut.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/zovaxijatomegise.pdfIn PDF document text
    • http://chapelguild.com/images/usr/91953936353.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/4f3ff217db3cd7ef613bf38c265f46aa/26244503869.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/9274089484.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/suzobowojujowaw.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/7834297402.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e99648727---bazejizofazi.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/xibekevigebil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=essentials+of+veterinary+bacteriology+and+mycology+pdf+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_off0000d275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD275 11352 bytes
SHA-256: a217bdb1266c0d323cfd208ba313c01e139078a4160b784adf3ae967a4564567
font_01_sfnt_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 18464 bytes
SHA-256: baa953c189e223312fefc2e264772e8c744045e7483c54301947b42a6bd1d222
font_02_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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