Malicious PDF — malware analysis report

Static analysis result for SHA-256 666f99e9ad4ea06e…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 15:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a29102304ae2335f738cc8fe165fea3 SHA-1: 340b518e370f3ebfebbc839a855740beb67d45ca SHA-256: 666f99e9ad4ea06e3a1acd9e0762e7c7a3d6788065d9db919cc28663ff52502d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URI indicators and the 'link farm' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=running+15+miles+a+day
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cd0d2768d---88946688216.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ae7rk6g18ej7nq1svtmuenmi8q/31302269535.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ccc44cbf636305265df8ed7282d75022/nalutujediw.pdf
    • http://apexnepaltravel.com/userfiles/file/24004719451.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/abbf1711ca39b58d270394e9e1400ce2/44385698472.pdf
    • http://haiphongcontest.com/images/files/rurivudurim.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58f2355ea---zopuxonus.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f5ad6b798e27a10e55cd43cefb0e3b08/rekob.pdf
    • http://computer-rudolstadt.de/upload/file/savegakobajokebizas.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160819a308dcac---mupisatonojube.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b8b520e8c---zerumoponuxu.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/96026053037.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3dc1ec708---14977897275.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde46422876---30676637486.pdf
    • http://agcslohian.com/userfiles/file/variparapavulazidifajepik.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb2a79a9f8---71743728727.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8i3ctv342qjarmcf72ok1ltvve/45345645175.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/sazopisuwozexedevovukev.pdf
    • https://planet-for-events.de/userfiles/file/84344015772.pdf
    • http://appartenvue.net/appart/upload/images/worijididutotopor.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7549cd5fa2---85073971500.pdf
    • http://blueyee.com/upload/file/112244249150.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b794e7a2f---talumimovemoberot.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210613_F615B819F986F5C2.pdf
    • https://larustt.com/upload/ckfinder/files/puzataturoweju.pdf
    • 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_off0000fbe0.bin
b901a93a2b66fe319025c643d5d4fd5af3af3500bcae87ca46f8cbbf460f3bb9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE0 17120 bytes
font_01_sfnt_off00012875.bin
6c6b0a03c5f17234f90c13b1708881f5c16cc76cfe8443657433f57e38398077
pdf-font-stream PDF embedded font (sfnt) at offset 0x12875 10720 bytes
font_02_sfnt_off000140e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140E6 16792 bytes