Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a58c3f768f6f1fb…

MALICIOUS

PDF

81.5 KB Created: 2021-06-07 08:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4b677bacb499529912b32e6baa051e25 SHA-1: 5968164a3c753258a974acc088fd054c50492a3f SHA-256: 3a58c3f768f6f1fbd4316fd43a846aa6f31ac4ce76d3da4ac4d792f6db521b2f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging strongly indicates malicious intent. The document body, though heavily obfuscated, contains references to movie downloads, suggesting a lure for users seeking pirated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://ketchas.ru/uplcv?utm_term=captain+america+3+full+movie+in+hindi+filmyzilla PDF link annotation
    • http://flatadministration.com/uploades/fckeditorfile/ziruk.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/59ceb913e2f3d916539f538c7926d207/17942544261.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/itrb3tt3nnghm4727jr2torjgm/mawariwirusilakegisuwebir.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/94e72111c47b2af2444a55a2b62c26ab/juvixe.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5f71c3a966d3f19609461d334cbbd4a6/wamifutuxubojawifuxanakit.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/28332234896.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/6aac1ece09fa207d2407a394a12950c5/feruxoka.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/4n3g194egk9na67b7dvtbt7baf/268062693.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/71q80cit94vk0eiveph7vdnp92/xosoti.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/nupexirutobetufozojapi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2626e4b5c3---75819744079.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/69117623618.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/759947669.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ce3fffa1e94eb4ec6c60358ad0162e14/41876934613.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/57570682946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 5500 bytes
SHA-256: a8c1fd6faf9c67e680805226a554372be8dc95bb79ba5545b8828bfbc37a553a
font_01_sfnt_off000114b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B0 10760 bytes
SHA-256: 1d5951157328f35588f9d45d7700e20a90a9ce3bc8abe7e22543cab8d69fe2ac