Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5c8cdf40e3e87e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-08 10:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3678de1c7a096d10bc9b9f7669909dd8 SHA-1: d98e62f3aa4bdb24cb868c2bbc6c0422e75d4c9f SHA-256: 5c5c8cdf40e3e87e649d548cd381df88c0d92c1d7381957edaa22527c0369e9a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and link farm heuristics suggests the primary purpose is to lure victims to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=writing+two+letter+words+worksheets
    • http://ktcz.eu/files/files/62964883374.pdf
    • http://scoutpate.com/userfiles/file/gebijisomupakeso.pdf
    • https://luathoanghuy.com/uploads/files/zujaxo.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/bf4f89ed1454966d2aef9c00965575c5/sojotamusokasano.pdf
    • http://zap-interactive.com/uploads/files/darakexenivuwojuxasali.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/mapekegegilekenakevena.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9df6dcd8d691d0219a7f69a1d38bc2f/14465102360.pdf
    • https://deshpanday.com/ckfinder/userfiles/files/56052252339.pdf
    • http://supair-lux.hu/ckfinder/userfiles/files/33597564498.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607911c7b20f6---34264702495.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161103a67a76de---sikevatusizukagagoz.pdf
    • https://cuisinescartier.ca/upload/editor/file/86523712304.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/zorigijumakefij.pdf
    • http://cristal-in.fr/userfiles/file/67830345938.pdf
    • http://arci-mp.fr/admin/File/76375180632.pdf
    • https://partetesal.ir/data/file/zezowukipabapojereter.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/af2a7b11482a4fe12d46338517b5d30b/nogixipikarenodejo.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/ritunimevezamesefopezov.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1189c1f69---dikor.pdf
    • https://jackyrouxmethode.com/userfiles/file/3915568901.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/6de0ef304f0171e055a31c06b605a99a/58624615092.pdf
    • http://zhuoxinlaw.com/userfiles/file/20210905172905_722859025.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 16792 bytes
font_01_sfnt_off0000ee09.bin
54ae843011818400c5f3747654b9d70e7d758dabc51eaad1ab5173d8a3c42f67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 17456 bytes
font_02_sfnt_off00011b0b.bin
8c87fa52bb85061d740702280590923a720e7afeab223729abe32d42c1cc0bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 10536 bytes

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