Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49cc497da37c47a…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 15:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3255101a1641ab83f8fab281f08aa8f SHA-1: 8429b6da27e8c0067d09096157b2772459d4eddb SHA-256: b49cc497da37c47a0af33ed5442cb8e327978cc103906be8d71347e6d2c1bbd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=answer+to+complaint+california+pdf PDF link annotation
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0anrge42gk48gcmeeee5rdqrn4/23979788000.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/60620628676.pdfIn PDF document text
    • https://biocoils.com/img/file/85736553053.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/63482274831.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/8114875075.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/guzarupedekufifal.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a870645e5b---wisizokurififot.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/49990842308.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/lokodotisipazen.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/zokuvafasedepano.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8bc82e0eeaa2b15fecc902985aee703a/92448404410.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7f31d588---tudidovurujimovuv.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/19g9e8vtgt1q7s9n1glphp6rf7/44556326005.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4f39a57262a60e9d17efc296e58e4c2a/32014471997.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/59060847774.pdfIn PDF document text
    • https://btegypt.com/file/69604230268.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837df2cbd8---vesuposu.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/aalu37aspoc2a7phcf6ju71efq/wepito.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a152107a8f5e8f43cb0061a3e107ec7c/28757720829.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/8d4spjugac3hknto30ph464gre/zajinijizukawomuzoluziluf.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/8615102448.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/damawemobogatox.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_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 18068 bytes
SHA-256: f34046d561a6e6231f1cd8037a75a40b2f02f3f415d5de02f7c2dc719ffbab57
font_02_sfnt_off00013783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13783 10848 bytes
SHA-256: b19ad92c9c4a01d66a17dd1abf6b515c51642c046ea71a53f3f9f41345c9a12c

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