Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e5281b3b4a569b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 20:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1139b7646b0cd3a3e7fe59c8b38c40c8 SHA-1: 03c763f2f2fdba8b24f990d65f88766a1d4ea801 SHA-256: 66e5281b3b4a569b39a76c77596a940033f1e5d3f29a2fa01ad846e37b5f4971
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nacionalequipamentos.com/ckeditor/uploads/files/rurokowilurasusefod.pdf In PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/terapopopuf.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/36087977701.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/46a6ff46790e34e847c7a95caca52001/35834596892.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/63463646177.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/80739494208.pdfIn PDF document text
    • https://tuinvandecruys.be/file/sivafiw.pdfIn PDF document text
    • https://felicityokolo.com/file/1123749081.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/63792039893.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e30d7344---ligudedosomo.pdfIn PDF document text
    • http://stefani.cz/fck/file/49679913492.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d2994bc77---vegifewor.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/77409062697.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/86152040768.pdfIn PDF document text
    • https://photofetimages.com/torekipajukamu.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/87246560847.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/fafamotesilinibaw.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/70028187024.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/6035709648.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/82143349066.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/pivumipifi.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/mozodivokuwatosematixomev.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/puwukujuwomijujukibutomup.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/sodidezururowiralavos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fire+hd+10+stock+androidPDF 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_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 17628 bytes
SHA-256: 0f0e04b2ec216d3d933b0bdcea3c005bee4155623a1eaee766ab37e3112324a2
font_01_sfnt_off000113d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 10664 bytes
SHA-256: cc19d40ddea7ea51ee69467c06af01e480ea49203b62dc8d56f8dfeb663e5df5
font_02_sfnt_off00012c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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