Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19ba304df9761dc…

MALICIOUS

PDF

84.3 KB Created: 2021-06-30 16:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b18db953172c8d21e571cc4c3145ed6a SHA-1: 3dd91463cd66d9a3f5fc3783e8759af18601f23c SHA-256: e19ba304df9761dc3abac49c132fe42d03367023d21876d25d63e976b2f3a94f
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various compromised WordPress sites, many of which host other PDF files. This structure strongly suggests a link farm designed to distribute malicious content or lead users to phishing pages. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 5

  • 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://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/dqg1imsl9o8pe0bia5etm206bo/fumuzupago.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e2a2e051---tetulazebedumedanaxedibi.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c15a1e2f8---58077710649.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893540498c3---kovupefagejodo.pdf
    • http://clubselectionvoyages.com/images/file/55495620528.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/pp8r7knpl6nf68aepq11kso5b2/sivowunino.pdf
    • http://www.cerel.eu/images/wyswig_images/file/94221811715.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d320506df0---romajutarotowumedo.pdf
    • https://aimara-bg.com/userfiles/file/luvefuzeva.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088dbc599719---menalurosirasovo.pdf
    • https://isosklo.cz./uploads/12048069469.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/50229339938.pdf
    • https://ekransamara.ru/files/31187853700.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b656326f3ddf3ccf21bebb97b867bd5f/21995761872.pdf
    • http://cnc-soustruzeni.cz/files/file/22330136485.pdf
    • https://malashealthcare.com/userfiles/files/95179914951.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6c9550c9f090c84d65974420db47db88/pexomapizubuwupulaki.pdf
    • http://quanhoangtsi.com/upload/quangtri/files/61462944334.pdf
    • http://accessprecision.com/userfiles/file/datewajepuzadowudotifunop.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ede804e2c9---vodiwuwugolanoximoj.pdf
    • https://giustofiori.it/file/kinaluponudalodefofalubu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=need+and+greed+quotes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d8.bin
5f26b7657a6c6206e831546750d4940e483208a386301a615f67e7f99386ca31
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D8 16904 bytes
font_01_sfnt_off00011484.bin
a5be3079a782ef4ea739b33e49b2b702bef370eafea2a5a36fe67df8575d70ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 10508 bytes
font_02_sfnt_off00012c0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0F 16792 bytes