Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c45fa40a18ecfcb…

MALICIOUS

PDF

104.8 KB Created: 2021-07-06 11:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fed482f8b0fde68b12ac78113dad2434 SHA-1: 8a771a2eabfcc0b92f0dfc70ee8569c5fd8ab148 SHA-256: 2c45fa40a18ecfcb62ce569680992334f58506d5bf4dedaaf4ff2328a0f83938
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and an ML classifier assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, pointing to numerous compromised WordPress upload storage locations and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ksjnbr2tu2idbp0cv5h993jnk2/4357320232.pdf
    • http://esoftland.com/userfiles/file/bajupuxakugomunizipe.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/clvki8bhasnpdhbunofcb3ttgc/tuguvone.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb265452d4---wikigibikadolo.pdf
    • http://sapaethnic.com/webroot/img/files/xudofenuwoso.pdf
    • http://ekbdrive.ru/ckfinder/userfiles/files/90382890471.pdf
    • http://cayxaotamphan.net/userfiles/image/file/23674706205.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160828d9c63a88---78861417856.pdf
    • http://daoltrading.com/userData/board/file/dizikezigekigir.pdf
    • http://bluekeydigital.com/images/pic/file/96754754942.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b369417c9---juzuguzup.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c470668e77d---65256276115.pdf
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/24790916288.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/25164384782.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ftkqto95v9l8fa8doq3ahfl97g/nelimefezugumupo.pdf
    • http://security-m.jp/tool/images/file/88819228101.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084652f233ce---zexizitiribilogegemaf.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b09e5708---22560255201.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/80542706006.pdf
    • http://ipceurope.com/assets/file/94601435819.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c9c47f2033f525c4131945c1dd0f4985/nokinon.pdf
    • http://nordicaluminium.ru/userfiles/file/nedilu.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/nutuf.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa50b2be22---2028897463.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608845862d91c---dubutuxanebatigavole.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/26ebc1c2bc57e941b66c1d3f36ec0ae8/nekewe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+three+main+countries+make+up+the+triple+alliance
    • 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_off0001371f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1371F 16792 bytes
font_01_sfnt_off00014f31.bin
4c19a4730bf70ba86664240c72b7e81cf29ec06b9cf6b59cad99fe5edb293c5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F31 17728 bytes
font_02_sfnt_off00017c88.bin
f2453d3d1a0e8495943df82d807329db73747017631377e5806a7a4f31f331c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C88 10824 bytes