Malicious PDF — malware analysis report

Static analysis result for SHA-256 df150e765af84807…

MALICIOUS

PDF

74.3 KB Created: 2021-08-23 12:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c625068fc5171a2143c6576e20d809fe SHA-1: ce30959040bad1eb5ed4c30f601b3e148fe4e4bc SHA-256: df150e765af84807ef6afc76f177029541ff1a73adb6695ac6893af9d9d24cae
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. This suggests the document is intended to lure users to external resources, likely for further exploitation or phishing. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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 https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aa254a939---vumuvebe.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/f79k0jn8rab1qhn7hhilo1c29n/81414805647.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/bilulipo.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210728092812.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/wesetose.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45dcae144---71425489432.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///47869121862.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/98038609981.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/75862568554.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/41hmcp7enu7skl9tqh79d45j36/lozesazuvujafujavagevelo.pdfIn PDF document text
    • https://actor-conseil.com/files/file/pulanuxibutenav.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/deeeb6a99e24f8d49329cfaaaf13d8f0/parofano.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/f7sq03t52q7gnkfktuifkcno84/67964456063.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/15396434036.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/35596465124.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/65307348660.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa31adeab---kazolademamex.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f4351daaeca88b9af80529f07c38638e/30482116797.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/zudasewizukusuno.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/98584217674.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/lolakun.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2cda549a---18250919553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=plate+tectonics+worksheet+8th+grade+answer+keyPDF 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_off0000bf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF36 11152 bytes
SHA-256: ae87610122e6409c4b839fa45d7982d91390eb6c565f4461be076e5a33bef77c
font_01_sfnt_off0000d91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 16512 bytes
SHA-256: 596efd4a9db89651b7e55b1a2794626ccf1f9cc3c00be1bd91cb18617a79294f

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