Malicious PDF — malware analysis report

Static analysis result for SHA-256 35aafa5d58b11aed…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 05:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c1e42a0496cfce7d246cfac0ea06ed2 SHA-1: f513b0cbf5071b558a2043409d9c820e9fb91318 SHA-256: 35aafa5d58b11aed9d107cc4b00daa02dd4a7d0a0aa8ffda865a7bba0e70d6b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or to download further malware.

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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b07591681b---lolubumevet.pdf In PDF document text
    • http://alacarte-grafik.de/userfiles/file/debur.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/2b396e67de1bf06da15b55f419228019/56511832128.pdfIn PDF document text
    • http://k1a.ru/images/files/file/lesininimeletusizezef.pdfIn PDF document text
    • https://ecoretras.com/file/74033460334.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161266d52a4eef---17434085685.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/vojipuzavezixonekopelos.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/nosomofu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acea6e4d7ba---66960112006.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/rekinirezeginiza.pdfIn PDF document text
    • https://vestol.bg/files/file/womedaduv.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/65677958789.pdfIn PDF document text
    • http://dd-eng.com/files/files/51561724862.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7a67208e---21995863664.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad0794eb8---64746347437.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/8229420151.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/wafuvem.pdfIn PDF document text
    • http://gtshotel.it/images/file/76319353692.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/63623901127.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/36510936950.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/43938091301.pdfIn PDF document text
    • http://nature-revive.org/files/file/panafafobazuvu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16076028f0fca1---xagaxavod.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bbada46be---saluzov.pdfIn PDF document text
    • http://jump360.co/upload/files/20210620043313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=durga+kavach+pdf+in+englishPDF 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_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 17488 bytes
SHA-256: 3db87fcbcb93547714803cf03b6a344c4b12366b7cab7bfe3ec8cdba176f0e2b
font_02_sfnt_off00012882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12882 10940 bytes
SHA-256: 7a2991716c78174da01b81cec05c67e87a086afde26f2128838805865c2f5090

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