Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bccac2bceb55d6…

MALICIOUS

PDF

83.4 KB Created: 2021-06-20 10:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6b24ec2a5455e17d929e68c565369592 SHA-1: 9976446d25cb5cb9b87a585334089f593d24a738 SHA-256: c5bccac2bceb55d633eb88e4cf3460f542fa279b318383b36a9f00d4bb2e7181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b8265ad2c7f69c6fa3d1baef19c8f58c/49105556226.pdf In PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d78a5ba8---12938278424.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/narurawuxiwibezu.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f1a7470a---21214664751.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/b64a95c81b0a062a6277d109b8d14e51/leboludejokerarizojirum.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/3630997257.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d140c57c06---77498707342.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aded64f40d---kakerotaserexitu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160801c51c12d7---75661616519.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98d02a5a4e---36903978210.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/idn5pd1qpdduo97f2ijudn9g75/gotasuvemumi.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/88076542010.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/b8i167rkrb0b4mmqhaeo7fd3r1/80930752947.pdfIn PDF document text
    • http://allasclub.com/campannas/file/56133364075.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c046c1f57---82515652197.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aqpura9rehudj837qgm4u6juq7/35311692507.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/95672279088.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/fatabij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=1200+sq+ft+house+imagesPDF 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://scripts.sil.org/OFLIn 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_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 5408 bytes
SHA-256: ec09719f31eba726f3f900cb554d3800e190199daf4b82d69deced4c72958b71
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 9620 bytes
SHA-256: d078c18523cda11eae675ef6381f3b7387ce4474b7dc129b6fc936e5eac4fa0d
font_02_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 17616 bytes
SHA-256: cfd106d82cb18b4a76ae907752b50f873557ac845fb0a7db58f3b63653220f65