Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7047b414405ae8…

MALICIOUS

PDF

78.1 KB Created: 2021-06-28 02:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a33476fc765dfbccdb39875a6062357 SHA-1: d66d3ad47df9dcfb3d88ad296a011a41f76a7570 SHA-256: 3b7047b414405ae867d77835d2e545a7e67cebe010a4f7cf607fe81427aac0df
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a large number of links, many of which point to compromised WordPress sites. This structure is indicative of a link farm, often used to host malicious content or redirect users to phishing sites. ClamAV detected this file as 'Pdf.Phishing.Trojan', further supporting a malicious intent. No scripts were extracted, but the presence of numerous external URIs suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4580

Heuristics 5

  • 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
  • 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 http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab49d67a4bb---11374067868.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd8798ad3---duremeliguwujokivupaje.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8264061cedb99e29414162a78a73a02d/39427061705.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/19455066298.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/osptc51gp7d5hlp9s3pdd58rf8/govezowezelagijaromibowe.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098386fa98b0---99867930304.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3d00e0f85---44628597129.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/pumepuxip.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/xamujofasoxipupibelolo.pdfIn PDF document text
    • http://ausafe.net/images/art/files/88907025763.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/zumereleziv.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/0e27f08f42492ffeca8e4afc89ffcbc7/libirelinafurudef.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072f89bf1419---poginutupemesit.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xumeladesopenuzux.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/wedibifizaniwufasuvonoziv.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/35903273160.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/cdf1bb01ce074805096d674a0f19186f/37234193224.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/f242c8f5b2bf2dbd3d019e847a0207e2/65087247387.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18b77d10a---82326154680.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/47715039710.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c993e04e979---modojitutut.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/i25a47e17pauvvm49cmoo98dk2/82878909339.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/dee56f4014dcea36a4da92782da2964d/muzibuvofikafip.pdfIn PDF document text
    • http://0930actress.com/files/files/pabanubaxugipiretevujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+use+the+dragon+eggPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 10564 bytes
SHA-256: 5f6fba6825f0d2a55c03a0e77ba048e84728377f80da63eb0736a5487d6be147