Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b07084c6315c12…

MALICIOUS

PDF

88.0 KB Created: 2021-07-04 08:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88685e0d30360978b8be439544d1698c SHA-1: e2aa26460d224f016645f27cceaf288beb62e869 SHA-256: 56b07084c6315c1213baaec851bf319b584210f31bf21dd052a0551dbdc876c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/9c5pdos77vk1ki743j06fkfvm2/70352438204.pdf
    • https://milsagliksen.org/upload/ckfinder/files/xubig.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2634f447ac---34986626437.pdf
    • http://skincarebylaura.com/clients/862251/File/45966608237.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/51n9805krjh3sb9gj3f6bcrdrj/36102984546.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bm0pmvl5u0nhcjn0nqisrb7sg6/20144549097.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qc2llksm978r9q7hion19pd3it/pupanipede.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a67d2d824ba22bcfe79a8f9e62fe9638/bokepiloritaxe.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/pajizujulew.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/1982ba7e2c0baa1c0ecf16d9e2c72977/fokoruvewadoraxokatap.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dafb958da5---vapixepuruzurig.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/3jmf7gu0u1p74fh7klr72os88e/3597714249.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609827a965a0f---25144588180.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a99602ace---worasufedusedukuwamakujem.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f2d53a04fccdfc213c287e2006ff25ff/120422473.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/22c3158860f776a8e6de075ed03473fa/50849637224.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8650741f8---74467111145.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/35a43e4524cf7f0d7ea5b4a6c600dbbf/xeduje.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0df7a8edd2---setelotol.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/7fce5d1d7b0c494c25e7152a4a520024/riviguxafopurawiz.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d709a715b---47013501291.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/783180cc7b80a3bbf8306b01251fb853/29681156974.pdf
    • https://oklogistic.lv/upload/file/15788614461.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=would+have+should+have+could+have+use
    • 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_off0000e994.bin
c8418406286ed5320a93f0acd349fec46aeffc4e07d66f0a866050f54bdddd77
pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 27504 bytes
font_01_sfnt_off00012150.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 16792 bytes
font_02_sfnt_off00013967.bin
20aa2110a36309f8bc78544bf04f0ba87f825926dfe358aa0585b88cbe60e81e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13967 10232 bytes