Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b52d4e487b28dd6…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 06:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da7da49af159f002b5adb5f0a70e5627 SHA-1: 550cccc866cb054456d0841d6988003512c20f60 SHA-256: 3b52d4e487b28dd65d5d7675a5bffeea443e8b3d35bed5ff0e5c95198c3e2ff4
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://noxsun.com/jingkelun/userfiles/files/20210625174724.pdf In PDF document text
    • http://orderkiwicafe.com/uploads/files/barusosu.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/fdfrcth5and1og6sllsrhbv9q0/70388695570.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/romuxitum.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7deb24232a---segoxujamolopumutax.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/26177095227.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/13721191997.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/jrl0hbhbitb7b6ur3o2d2o7p34/74583739912.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/zekozulebovufifikikolawu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/sifizigowawilevegolosak.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a081e441be3---wadebanukegalapudirate.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/46453519026.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/93854942260.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30775e714b---vubojogerejakulujisub.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/76265253491.pdfIn PDF document text
    • http://email-database.info/userfiles/file/6792015560.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fec1b75cc4dbdcb8b97f0e0199c618e8/42491118180.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/63535911689.pdfIn PDF document text
    • https://gangnampools.com/contents//files/zukimulaxiwajatudul.pdfIn PDF document text
    • http://mesterek.net/tmp/92740173763.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16109f7ed7a16b---90748096473.pdfIn PDF document text
    • http://indemo.pl/Image/files/98664385653.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18300cb40---82059574266.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/30070563338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=vitex+doniana+pdfPDF 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_off0000e5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 10248 bytes
SHA-256: 70fac211acabc084a43b61d4a62968daa8fb031ec59b2e7d707704b9934db23e
font_02_sfnt_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 19432 bytes
SHA-256: ab4c881352653a09965bf9fd0125d0a268d607c6b3752790b94c9741b6fda0db

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