Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6511b25f1e30ef…

MALICIOUS

PDF

64.0 KB Created: 2021-06-14 18:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 889e4404b797fa9b05c58be2f19032eb SHA-1: 603d102d90d336a38d167aa9b2a4a57a2515a2bd SHA-256: dd6511b25f1e30ef22b7ac66c2c6b0e866fcc710210fe23efb11a95c8730a22f
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to lure victims. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

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://archism.ru/uplcv?utm_term=my+talking+angela+diamonds
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e0b256819---14664123606.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/7deb49a90909de98d56d472514323083/dimosatapekajovopek.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829a60c6e60---xofirivawuzuwi.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8770176060---niwopetolaj.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/jf4nc3n4e2eu418qi9osng4nv5/84556467089.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14c46ee9f2---65595116075.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087e875772bf---gozas.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/xewufevamerineb.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c41d9f845---badikapafapewabatetololip.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/4d9f4c761ffe87392d0ba7f755577f15/72158830606.pdf
    • https://mollis.rs//files/72090158848.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/74514697076.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/229629f9424724f85cec2686986e181e/pixaliwadij.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/603f801116c72739b27ad5e466c6c8ab/92722362921.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609894bca092b---pidakes.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609875bd4f9d0---rusalesomorasojatube.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a769bc38427---18998344920.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e506.bin
8399f779bd0ad9a4bdd7dd9d47fb1366b0a8ea111750c465565f2a8f857a72d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE506 5008 bytes

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