Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f48ae60988fdb63…

MALICIOUS

PDF

76.2 KB Created: 2021-06-14 22:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a57190cfaf6f969063342e7a4fa83703 SHA-1: 1d72a079c2f0bc2dcf5ec306386cb8c3875347ce SHA-256: 1f48ae60988fdb6336dd7be88cfa92fa5e8f8e4089cfe02325d5de7c3b9a2d61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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://crysiq.ru/uplcv?utm_term=avengers+infinity+wars+123movies PDF link annotation
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e95d606693---36457502505.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e5cf0eec---pofiluperitixufegigi.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/55561979661.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/14c63b90ec53257571fafc90dacaa97c/fawumetet.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/g8s51ff3t66bsjrf4vebckc9ej/kibumirezupurifotakar.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/33749456611.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/23296101947.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/9d72f1f37db9a65076879ee7b5d1764e/78726687971.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/5dbcc15d12992d49126b15668a5f1665/fafopagoniduwigefunitak.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/5ljr5305menvfibjakgtnjg4s4/balasatunesolim.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/64653251149.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f116311a3---wuxobepiparelapufeti.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/wenitubozideweb.pdfIn PDF document text
    • http://ruresept.ru/files/file/potalefaka.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160807b06e9296---29855928466.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/rebugufavanetevofaboxak.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ai5asn30ddonsvaahkdrjuckei/68062085124.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f13d2c1cb3a7c6d7b5f74151d5c7407c/9540836392.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pokuzufobaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 5436 bytes
SHA-256: fe0624cd443efb28c8ff00f1d3b13ee0e242cf5ab3d8e9ab4d2c9bcbacc0a19e
font_01_sfnt_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 12328 bytes
SHA-256: b20cad13f59009ed69bb092d71ab9f252787a573f2b31da90a6d6bfc66c67965
font_02_sfnt_off0001156b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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