Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9423094fff73c9…

MALICIOUS

PDF

86.2 KB Created: 2021-07-09 12:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 326f4816f2e2d13e4391114fa5cb5c9f SHA-1: bd615d26c6a8a58cbc13e1a3cfbfb37413dfe5f6 SHA-256: dd9423094fff73c9004e3f330e6a2e188c0aa9b4278cf32378472e7082a64d61
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mousike.it/img_ins/files/80669527348.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/dd37e1041d18ad36858a735ca51711ed/nuwig.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e55a39840---36081365574.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c9125ea6f---21165630189.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088722920e3a---migatetodovebijakeratej.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/12af8da01a709431eaddd183e43f882c/pelupubegalofipiro.pdf
    • http://geredekombiservisi.com/userfiles/file/lirokorepejig.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1541fd88---26309195616.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2b9cf3268---vokus.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb912348a---17466270553.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f709a3bfa---ratef.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/28d88d1dfa83a8d37bc51f886695b8c3/rimax.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7b293774---dapipasaxazifukexigiw.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ed6331af---49098780111.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/dokeka.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4005025f2d200acbc6db39b0f15d8ece/katatidus.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d054db3e6d---10656099544.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9492e27b75---jipewiparero.pdf
    • http://adveotec.com/img/file/20832409111.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2591d59a97bf966fdd52863f7d68e25e/91523125606.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/78e7ea405d01d53c96eb182cab215ba5/32446315942.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/8d8eb8add51281cbd7d8872b055f1450/23555932432.pdf
    • http://gadkowski.pl/repository/filemanager/file/72838790892.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=utility+marginal+utility+and+total+utility
    • 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_off0000eef9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 16792 bytes
font_01_sfnt_off00010710.bin
909488501f82da70a6e2f6d93676090c150bc35649e610f3540e380600146a3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 10512 bytes
font_02_sfnt_off00011eae.bin
b85d5869739052cf355c15633cbc603b14e09e131ed759961b9fc1ad67610073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 17000 bytes

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