Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92e80d1f2e15b74…

MALICIOUS

PDF

83.1 KB Created: 2021-05-17 22:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3ed413b737dc299ff3283391b0208aa SHA-1: dc9ea374e14b6d5e550ae8a3d8e2ad611fa0d86e SHA-256: c92e80d1f2e15b7472edb8f9ab8b1258e6737f0f36d2324309e297cd3de5d075
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs and link farm structure are primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8892

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://chcial.ru/uplcv?utm_term=spin+the+lucky+wheel+quiz+answers+2020
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9hmn01m31f05f2rt808cdhg0rh/xubogu.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a09ce38e---divipisazavupezaxi.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a086945243a---59751153462.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/f26e8c91264c04e973c6125249178be8/dadunoluvakufiluvelele.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/977da6370eb7e5a65f0a04099bb8399b/sugakulaxagi.pdf
    • http://peaceinsrilanka.lk/userfiles/file/73818792447.pdf
    • https://chp-travel.ir/data/file/5457184067.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072629f5d3b4---58303267066.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/up8rj6ujs6l3sj7m9kllp0lkh3/dewurapomojikaromo.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8251b49c0---rojuwumunilabosaposagup.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e1f77cf22edb3c1f1ac01df30e2daf02/bepoxujevuratujaxudobis.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/7c7a36c7cb81d89da4911f390021e77d/71414817773.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc7719782---10455543341.pdf
    • https://alarrabnews.com/images/content/content/file/61248269710.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e1e9ae077f05a0dac385a0479d344475/kinorizitalimekilogek.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ae5cec88bebc765f05452afabc1e377e/35134406451.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/09b88630d002349fb72d7cc9edfddc05/49263570902.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_off00011648.bin
e6d261a23d5f8aa8af46ffcb1b9bc16fd001bf95a316df2fccd774cd27e6ecbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11648 5832 bytes
font_01_sfnt_off00012a3e.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3E 1800 bytes

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