Malicious PDF — malware analysis report

Static analysis result for SHA-256 4136beadac6e9608…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 06:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8bde4cdd7e0e4363e4b8186013e994e SHA-1: 727dad4ec5527a60a6ec9a965682c5bedf93ec70 SHA-256: 4136beadac6e9608dc67b9f1c844de7419d6fb19df7e4cf9e80f17742e5e7850
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and multiple external URIs pointing to link farms hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6c9e4bfbf---gopuvaxewadixak.pdf In PDF document text
    • http://vietthanhstone.com/images/news/file/vamumokunelodifudod.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6306920c6---xevuzeledawev.pdfIn PDF document text
    • http://maytinhgth.com/userfiles/file/duderus.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19276032d---82579777654.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/jefuwokisofuvobanat.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceef39ba7e---9895621044.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/17lf21tuu2ci83hinf3r0g5gm6/50235149655.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/42695096114.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/kusasazinalutexa.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/b8dea2291a7c2fb50b7d8137b4b27747/zubuxek.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/sezawonipukotasar.pdfIn PDF document text
    • http://labradory.pl/file/luxivorowawaropebiw.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/90380673956.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/41056100476.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/46689293464.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/gulutudolizukabifalu.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/mejuruxosakopik.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/xadopexojubuwujoxovumiwo.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/73331229681.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/57637893504.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/50fa52797633433be1a39ad04b0570fb/mizimakoxitibokunebeli.pdfIn PDF document text
    • https://0900107678.com/upload/file/61007703199.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbb9a49c1f---54621957516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hack+iphone+with+kali+linuxPDF 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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 18304 bytes
SHA-256: d0c7a2d46e7f98ed63ee1f27d8c452bd703524da7bc144702a17259fc8786f6f
font_02_sfnt_off00013581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13581 10572 bytes
SHA-256: d4ad8412392fba8a805bcdd855a120c9c1aa90bed06baf91c31987802a26381b

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