Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb412d353ec00afd…

MALICIOUS

PDF

79.0 KB Created: 2021-06-27 07:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db78575ee19890052734bd4bc8492552 SHA-1: 5147c517beb596d5705c6a60f38f7340f9e3ad87 SHA-256: eb412d353ec00afd30ba5f48b9230e637b70a846bed252a26b34826ffca4e1cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796b670afcf---kifesuf.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/43f66622b9542d291f4d35c98efee634/99287000029.pdf
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/cab987b2b3ca24b8069a19285e79debd/kinusorijisi.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99daa693f---77267307861.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c421e35858c---jajex.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5f0150a39---49148149204.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/3ef756b7a4c06a032d975e5f54521c97/90405693133.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1406c75f---datedapivafezidaniwoj.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9eff60e476---25633675403.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/00d2ac5d4b9e654e3d52b3ef2c6058c1/73383906733.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d7804247---3519708400.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a70eca733---kekewobu.pdf
    • http://poltinik.ru/userfiles/file/71694695758.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608667bbb682a---pamilalakikakevox.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105242043106984.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0ebea7cd---pivawejuwot.pdf
    • http://bettynblue.com/upload/fck_img/20210521/file/85347602027.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba3b684e6d---42130162957.pdf
    • https://leganordavigliana.it/uploads/file/watakobilefevalu.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609038453d9f1---29083272620.pdf
    • http://oreade-breche.fr/userfiles/file/panojobuwesusoxubogitibo.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608788a3e61ae---vuvinifiwovapekixute.pdf
    • http://indago-rovigo.it/userfiles/files/83967354459.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=easy+method+to+find+square+root+of+any+number
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee46add555---dipexaburenoviwekexadoli.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_off0000d0cf.bin
62e82bc7368e626befb8d0252864bb2ae76954f5ef904e11553ad6b7d8b90f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CF 17288 bytes
font_01_sfnt_off0000fcd0.bin
ec475096e5ccdfeab00d3f7046198cf805c18d163acbe2f71eb4d239417b135f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 11056 bytes
font_02_sfnt_off00011630.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11630 16792 bytes

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