Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e16e7012744abf1…

MALICIOUS

PDF

75.5 KB Created: 2021-08-28 09:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d16d78e7ec1b0ab4b6281268b0ad05e8 SHA-1: 14af7153fd230a12380e53e69b8476b31a9934f9 SHA-256: 6e16e7012744abf1c258ce0121a86305ca6b4111087ccf7155d220526e85ab1e
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of multiple external URIs and a link farm on disposable hosting indicates an attempt to lead users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/002574d9a2b79fb3466629fc807ef1d5/57134833990.pdf In PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fbc874134b72c37bfcdafcb2acab9319/sewij.pdfIn PDF document text
    • https://advik.net/userfiles/file/pejozesamiboxevuzibugezu.pdfIn PDF document text
    • https://x-software.cz/data/file/84923711006.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/010056247459.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/63884983765.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/vagixidim.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161125e2a6b6ae---felumisulovibivezaniga.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/47264860145.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/e2b58a0193e5ef519184722c355bc0b1/70576847108.pdfIn PDF document text
    • https://path.mn/userfiles/files/90083917173.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/25689397448.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aba9b41c200---fevadugefamowovawuxokij.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/19699468330.pdfIn PDF document text
    • http://thegioioto.store/upload/files/90877245300.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/vubidekusopepaperokavi.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/39693728811.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609df354f077c---zuxosupagu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fpba4rllji5u83ti4900268npl/muxas.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/3bcf82abdfc583c7c9bd964d0a4235e9.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb1abd476---zofowiwotivanerimobodi.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/dimubexibibexonamijulog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=read+ready+player+twoPDF 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_off0000c563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 16784 bytes
SHA-256: 36395c20df5654415ab5e4edb835c3ef43e16ceeae0bf39e8e9518ec6f60cf11
font_02_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 10264 bytes
SHA-256: 967bc727d6d7e5e3633fd0d8cb4bbbbd1c405527524a3d750acdb0cce85205c7

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