Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6176cbeb19b940…

MALICIOUS

PDF

106.5 KB Created: 2021-07-07 15:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ea03532aef5e7abf7db9ef84117ceac7 SHA-1: dd23c71d169ea1e29a11464bed8c000144691884 SHA-256: 5a6176cbeb19b940051adbd99bca8ebe79ccec44f9154a765e08e47b68be5934
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or lead to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sportuna.be/ckfinder/userfiles/files/zulateruzetutebesoxes.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a2acead7---18162666424.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/85152232596.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/53423781918.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/jumobopuwamajiw.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72975f21b8---25213924975.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/be81789ad07724050433fd45c6774d0c/xiladonubijovovosutiv.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/kokukiruxafali.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/73118930627.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fbecf307---turenekizabekuxa.pdfIn PDF document text
    • http://atek-ent.com/upload/file/5169863238.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8bc751aa---kubabetebarovip.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021051700153774.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/788a26c461794dfef13dcdc345346781/getewarigaxozeda.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/478f7050ebf8307bd3bc16f672648d39/4785177856.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/13650935617.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6b5595387---6433685389.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/1d4728838e8d2b22e3ab5744e2548f02/28843375385.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/92281793299.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/b35dmk04f5o0ooiceopvbpovv6/90681818497.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a8932eb3e---80584964568.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/vodenupuregu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sample+tv+show+pitch+one+sheetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE8 10764 bytes
SHA-256: da9b57b6f93becc7744885e759fca3d5560ca3bb2e7d8da21eb437deb390b71f
font_02_sfnt_off00016885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16885 19044 bytes
SHA-256: 99f15fa423396d477555d739d19340103e94cce5d9508d027cb3ffcc33902fea