Malicious PDF — malware analysis report

Static analysis result for SHA-256 25553c2667b8bf66…

MALICIOUS

PDF

93.5 KB Created: 2021-07-23 09:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb7c43151ef05a96d257af1ed4680a93 SHA-1: e7b3c825972c73e86f1f7d31d5b382b94f7ee683 SHA-256: 25553c2667b8bf6676d150cae74ba35181a2099bc275f66d49641c02e7a96fa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's part of a broader campaign to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://atthaya.com/file_media/file_image/file/nifunilusekom.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67e05e30e---17144644324.pdf
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/lisagajeja.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2cdfc4764---dagabuzolezewez.pdf
    • http://uniquecharacters.com/upload/files/73222065718.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bcff00b48a8a47593db4383e7d9856b7/20946080078.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/79790b449528bcbb1fb801af467129ab/mamifiwogitexowonitizajuz.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa21ea2c8---fijowifeke.pdf
    • https://sluganarodu.org/userfiles/files/sapuw.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608016232c973---wosenisuzakibo.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/88969fe6225f7f70cd3c7ac883a3bd07/maguragenifet.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbab8e4ed41---52793611299.pdf
    • http://aeronautike.com/userfiles/file/tukewenejubaruw.pdf
    • http://ankaser.com/userfiles/file/99378941662.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160766dac20ce6---vutalojamexikogapibebuwo.pdf
    • http://csc021.com/userfiles/file/20210718200508_nspotc.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/puliwabibo.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094240d54ca9---73819852501.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc28b1ceed---64701883762.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3c08cb3af---84661437656.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/8c809dadc253de5b9a505e5cf9bf56e9/84965186695.pdf
    • http://happyhanool.com/ckupload/files/losaxubibonejemaj.pdf
    • http://thankschicken.com/uploads/files/82069591540.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad82164f297---31248976001.pdf
    • http://belgium-ex.com/images/blog//file/10108906329.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=college+friends+quotes+funny
    • 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_off00010bab.bin
cff9279df47008fcd024b29fef0fd9aa660d74277817d6e46d376af707a29ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 10756 bytes
font_01_sfnt_off0001240c.bin
243f82fefb18dca25d06374855a3b2d2bffcb54b1c12d9888ca1fdb7f1bbfd2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 16712 bytes
font_02_sfnt_off00014f5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5C 16792 bytes

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