Malicious PDF — malware analysis report

Static analysis result for SHA-256 3adbad21f7edeaa9…

MALICIOUS

PDF

85.8 KB Created: 2021-07-06 10:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6020c3ecc79acf4a6e48da2ff4006bea SHA-1: d785ac338d9b8b461e041f01d49df078422a7623 SHA-256: 3adbad21f7edeaa9b08ebfdf3b3f6dfa91d310aa494f7ab726929d952b952caa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of external URIs and link farms suggests the PDF is used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://chcial.ru/uplcv?utm_term=typhoid+can+spread PDF link annotation
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/jaselozapu.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/bemidudagakirekafada.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c045a1bf75d---xovisafatekigebaliresan.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/fijonesuni.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/83103861330.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/fevivinuve.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0d9vk53a5hl8e66a4o9tb2ram9/86826856392.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e2e52dd11---87016912480.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/nowotajajasonemojikivezim.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/31257380414.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5a6357df4---79114594771.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wekupulerazokasagalak.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c89a8b345d5---mitomolemutap.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/98182783024.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/medewixabufega.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f047fd26ee---kokizumovuv.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8b03f663---5988556017.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/2645151858.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9073853dc8---53951468745.pdfIn PDF document text
    • https://asi-filter.pl/files/file/wufaxogifonofigogadareke.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78933dc817---79506889749.pdfIn PDF document text
    • 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_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 10544 bytes
SHA-256: 83f462a3db9c3dbe4a2cc0445a36ad32e3cb8387f725f251e3409ef8df33cf06
font_01_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 16984 bytes
SHA-256: 44c963f8efbc36ce508bab0df52e70c49de39e07df340b478f1237a6da40d246
font_02_sfnt_off00013275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.