Malicious PDF — malware analysis report

Static analysis result for SHA-256 0377cd8a4d169ca2…

MALICIOUS

PDF

73.0 KB Created: 2021-10-01 00:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5e74747a17823701a1a1987e0e4a46e8 SHA-1: 0ba917dd5bf9458891a1e8a52d1c1aa976c9e60d SHA-256: 0377cd8a4d169ca23b8af9f04711c55e422a4ede5cb12e60d6d1620e387191f5
104 Risk Score

Malware Insights

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

This PDF sample contains embedded JavaScript and is identified as a link farm pointing to potentially compromised WordPress upload storage. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely attempts to exploit vulnerabilities or redirect the user, while the link farm serves as a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ingpiazza.eu/userfiles/files/94418533572.pdf In PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613592c044354---vinukebazowisogimi.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/wuxalibinusabewatuzefufo.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/nuxuxazapunasekajevexo.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306932954f9---jelefosejotakesizivof.pdfIn PDF document text
    • https://fratellifurloni.it/file/44959711147.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161362bd22c251---nokobuporipawut.pdfIn PDF document text
    • http://kes.org/upload/editor/files/borefesifirufo.pdfIn PDF document text
    • https://bliznacite.com/files/kilisodibifimolovimogolop.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/42522113034.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/73368184253.pdfIn PDF document text
    • https://acatay.daynexdemo.tk/upload/ckfinder/files/kuxem.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/xasomekodimokedol.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/vuweburudewuvogojefuvuvat.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/41155859226.pdfIn PDF document text
    • http://namngonviet.com/user-/files/99414402139.pdfIn PDF document text
    • https://zzwgjx.com/d/files/80783385747.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/57734734272.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/romufaxuvitokuza.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/nixuxoxilalidefolaluxomi.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/634db55f2e0dc94741ecafd8c2d57b97/vijorawewojogab.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210911132224.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/9630627894.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/2067859732.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/ravuzewizutiraxivobuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=luisa+piccarreta+divina+voluntad+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_off0000b72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3D 17780 bytes
SHA-256: 96f0a530a3ba9e0de12bde5b14104d3eaf0cf50e97796d75cb96d0f68b009455
font_02_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 10736 bytes
SHA-256: 2a540a8a48627561060db594ffd3a71594e04d8f9bdf9a27f0bd093c7b904b5a

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