Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1b271ee98bf863…

MALICIOUS

PDF

84.3 KB Created: 2021-09-06 20:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ae7f11f7fb6c4ec1a706edda2593056 SHA-1: 5f2b43fdd4ace5afe35c2700ddbe54d0fa7260ef SHA-256: bd1b271ee98bf863db916ed3708798999e6b7f57277488ea99855fbd4e3f91f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues about the content's purpose beyond its structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

Heuristics 6

  • 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.
  • 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://aftckwt.com/uploads/file/bukevunoli.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fd4eebfd8ace5f924ee3dca8350e1a58/8493006183.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e064418d---54397277578.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/14125402980.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/doxila.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/81525668722.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/xedokibasagufafofedog.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/385ec8d9ba4f2ea2219eb5eec62246e2/diboxelo.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/12624bfb6e438722e5d5f74bf520969d/korusa.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b9e3ecfe---18473992020.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/esat.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfa564ce3---goromadivugepawedimo.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/gerezunuzer.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20217152036205858.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0383a1830---48772134393.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ksesnho33mkd2nho5apg8pui1b/72416525444.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f12c1b532544a49988a50c45dcf2b80a/zaleworituginogujidekug.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d835b0f0cf---kulisevux.pdfIn PDF document text
    • http://abnicum.com/files/file/35395944543.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc0ad9cfe---ropaz.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b3qgftlol2inokq1c9navorro2/28157731696.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9181c03f726fe272d03f55aee8fd0e9d/41301366330.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613301fc5a837---kodotapavirigodemoza.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160baa623c1d22---subelavizarigudip.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/bexomimakonadomewugekube.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/77573142478.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/dudofak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=consumption+value+theory+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 11076 bytes
SHA-256: 3550ae8e693f59e46bec131d422a493f3a781ffc25b5acf43d8e5028e43f8c54
font_01_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 17220 bytes
SHA-256: a8ff10a2659ddc055f26dda16320bd53f16da18d5633b45faf9fae5489b185d8
font_02_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_03_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1