Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a6948f26fcf711…

MALICIOUS

PDF

73.4 KB Created: 2021-05-08 07:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e1233b44b5e16b67a5e216742a260c7 SHA-1: 6bca4f07cd786219b8daecdcc6911e33894eb38d SHA-256: 80a6948f26fcf711eda2ed52c112d56a229fc6772af9e37100299e86b39f1723
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8762

Heuristics 5

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=intermediate+accounting+valix+solution+manual
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/e1b2729902e908891ad97554a17f895a/39543986481.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/53fc466cdb3c04a8d71dcb1702937676/mumirovefefewak.pdf
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/9i2ib01t4eodioore0shl00qtp/67973204220.pdf
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/e148cf7e35b1a565680b3aad32a81476/zosuzaxamebekavafunorakep.pdf
    • http://reicar.dk/userfiles/file/16574770591.pdf
    • http://quickvideo.nl/userfiles/file/guranunupomudafatonikodu.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779b0852d70---sugovunis.pdf
    • https://aartipalette.com/userfiles/file/wevexobasuviwuf.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/bf07027323946e0e0a665783146c79e7/90164430439.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729cb92281f---32405629407.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ruccc5ce8cvk49g35cteb7cvc7/nafivajubujazekotogumu.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727a08d49eb---28224004846.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tn2vglb0i8tjrfuqdmrcoln640/97339239496.pdf
    • http://zabradli-znerezu.cz/userfiles/file/57158555980.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dd7dd6e75---mudijojokav.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b75733729167979b33f484f9d21f93e6/jizal.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ff5b618c---89651778618.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f195.bin
bef2688f8d34e9867829aec8ad78c3752fee8549dd34300b89ab9e0ccedbd349		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 5204 bytes
font_01_sfnt_off00010328.bin
609056d8dcff84ae75babb0846499525b062f3b3e6b79ce8527fad8e47030ffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 10516 bytes

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