Malicious PDF — malware analysis report

Static analysis result for SHA-256 f608e62b8330b516…

MALICIOUS

PDF

87.9 KB Created: 2021-07-22 23:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b3f39fcb9e11f45a48d36fec107e0be6 SHA-1: 887224cec9c2d99d49d7994dd03bbfe51b4c6942 SHA-256: f608e62b8330b516b668db9ce39ba205315cc60c6d20a530ca4e5cd16028fa22
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9556

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.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ee8109b32---70015215374.pdf In PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/3e126c76494dbdd0eb033d2298f83ec2/50947920226.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f06ba8cc2a---7361849719.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/dogegugela.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/42483936483.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/xunufo.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/gatupusemugejufubireduto.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096f88d4e669---42112608838.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6eb82fb22f3400183303aa1b15258c44/20628010662.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/70978524368.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/f064ced705394ce3225aec49a479dc64/gebolevotovilumiwokuni.pdfIn PDF document text
    • http://staropolski.net/Upload/file/55197390087.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/xejopopejamuxon.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/4932e0452c45ab1a51e3a6c78908b4e9/89487357609.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/t3akvai65n065dgtr46sc12vfu/25518111274.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d488bb0be---73045744446.pdfIn PDF document text
    • http://ps173queens.com/clients/10779/File/wutizilasizurim.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6043853331---62815034241.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/45892030595.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e6072d7bf---48846634106.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160981d6730b10---bakad.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/7497067019.pdfIn PDF document text
    • http://riversedgefm.com/files/file/wotepunoluwasuv.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ldr2ifr9o4re45o36k8ntqlgqr/puzararobubod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=rocky+point+pine+barrens+state+forestPDF link annotation
    • 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_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 17380 bytes
SHA-256: 1d36b05d52946f92d99c3e8579b1f61993dec848bb883d058db18ae9be14255d
font_01_sfnt_off00012fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA1 10816 bytes
SHA-256: fd1e61160cf1011f2120007f38d3bf1f1901caac80d0137ff0c8a2b2510119ef
font_02_sfnt_off00014899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1