Malicious PDF — malware analysis report

Static analysis result for SHA-256 824b50909f4a9c75…

MALICIOUS

PDF

77.7 KB Created: 2021-09-14 06:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78e2e9d6a52e332dc0446e85beb2749e SHA-1: ce2b86d2bf7bab5cbeadad0322eeab92f2a7910f SHA-256: 824b50909f4a9c75d0130900831a5a3c38a8617758d322a154027d87ceb58f01
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, strongly suggests a link farm or phishing campaign. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://haliburtonhighlandsheritage.ca/userfiles/file/nubugewuwibodalekizufelu.pdf In PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/fumifov.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/zenukisezevagasixi.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210911_5FE517C33B0E989E.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/tenemagegotokusebiwo.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///97632807614.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302c89ee91e---xozovugiwejubojunizeli.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/18390571499.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/35c1436a2c2da98692534601ca57b251/geluwabemunebunesifas.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/pisamipofibezaz.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/15705528866.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28970f4da---69343412561.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/gilanokamunabozupogulatek.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/segegedimodoniwedapitugov.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/dovmf60jeqiamsrk3h6bjkr7g3/58005640746.pdfIn PDF document text
    • http://africareview.in/userfiles/file/lumezulitagogolenenobuga.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/bolaxifusepa.pdfIn PDF document text
    • http://fitviewer.info/files/file/kopujulizafasakimozato.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/30525609632.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392bb0e74cb---19595716900.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fb803b6bb---5609985674.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/zozolivajetizalur.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/kuzazopedofefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+play+ds+roms+on+androidPDF 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_off0000ca9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 17836 bytes
SHA-256: 31cac9154f640fe56454a25e3833f95afe779a506c95fd744cc246a3058f190b
font_02_sfnt_off00011145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 10612 bytes
SHA-256: 14cf98c9dc54e5ff7ef03c31b37b0e216fdb171c7717cde2c51822f4887cbfe6

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