Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b72a33dda245328…

MALICIOUS

PDF

93.0 KB Created: 2021-08-14 09:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92adc8a755d59acb0144bdde5c8d832c SHA-1: d3eaed5e584afd8d3010a20d5838df0d78299830 SHA-256: 3b72a33dda2453284a2af428eb533d819d2cd2a54f9aec05627e026ae6c6aa49
196 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits characteristics of a social-engineering lure, specifically prompting the user to install a browser extension or update. The document contains numerous links to potentially compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. While no scripts were directly extracted, the overall structure and heuristic firings indicate a malicious intent to deceive the user into compromising their system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://master-service.ro/images/file/5627243988.pdf In PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/95749284717.pdfIn PDF document text
    • https://zzwgjx.com/d/files/74945530942.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/pilatotawenegevufidasoned.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/nigemasenafoxajimekoga.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/003192c0069dab6b81b1557ec23f89d1/tulaxukobelukulova.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611737e9f21c4---zonuvafeb.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/99816521643.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/domuwaw.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ace330478f---bujiferebeketoduvuniti.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d037a0e9137---47047237915.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/48070344024.pdfIn PDF document text
    • https://jetaime-shop.com/files/32031333752.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b7506fb8ba6---46688100182.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/47485778822.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16102c189cd99a---kubugabuk.pdfIn PDF document text
    • http://614move.com/clients/4890/File/jogiv.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/46059567896.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/fuzuvotokonezufubi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/193e814dce45f32fe17e751a3d5c7f26/81235123103.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/16684329392.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c5727d216b1---dixexuxowab.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/42270959810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+factory+reset+ellipsis+tabletPDF 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_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 16888 bytes
SHA-256: 310207e4b2f36c979d2610fdd6b50f8aadb415a2b1f63b75d95a31a211489f3c
font_01_sfnt_off0001348d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348D 10700 bytes
SHA-256: 5beb2a166054111b7b2603c91aa31bd062a97897f9b5f8c4654fea8322df2710
font_02_sfnt_off00014d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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