Malicious PDF — malware analysis report

Static analysis result for SHA-256 016e82b2082b7030…

MALICIOUS

PDF

87.6 KB Created: 2021-07-21 03:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f213b38c223c787dde624ebb1d3dbc6b SHA-1: 64023272e981cf3e4bb3bb9d2764c575be1daf31 SHA-256: 016e82b2082b70308e204d6c94c6ed12d1477b460d431d590bb6d037e1ad65a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://noxsun.com/jingkelun/userfiles/files/20210615194943.pdf In PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8f5f9e9fd---sureruge.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/3412816647.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1897a0383f222e498137b98ae334c48b/mudewewujuvuziv.pdfIn PDF document text
    • http://halmar.info/userfiles/file/76724629349.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc4d99af8---mutapiwawuxadikabop.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/7d238cd95a1ff26362a55291524f2ac6/dabelow.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/91614704573.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/sawavu.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/20993819620.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ed970110515900ddac423a6ec5a27f0c/dololadugido.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/j7gb2icafupffiainv2n8c0tjk/29355078804.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/ferebitawudokusaxixoduto.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/f5udch21eu6t96e46ah38jjb65/fiximevedexemorez.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8c35d92d---43275131759.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b1a343e4acf526608dc0d1e7d1552924/zapigalijo.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/60584795880.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9mncd8cp04r20cki2t74c940ki/vawepazavo.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/tuxezekasaxorabutipap.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/waxipadaba.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/62318604009.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a499407032a---77710071234.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/hc04n0rtb305qphup846ddvmoe/96586958209.pdfIn PDF document text
    • https://reniuved.it/file/besinibizuzisavavemano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=portable+foxit+pdf+editor+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_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 10652 bytes
SHA-256: 6db89fe3781f6177037e4bc85e97c6538cf0f824107b23104f13d31e444b12d0
font_01_sfnt_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C6 16776 bytes
SHA-256: 34abfd6a908c27647ed96b66bbc9aa49680e4057db6a9b07e5c461685ee6b3b5

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