Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d04e6a25f6ed218…

MALICIOUS

PDF

74.5 KB Created: 2021-07-01 01:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cf339f1a8c6833407a95c35069e910a6 SHA-1: 09d90f13b0ae7f31b7f0324de691429c6cf0ba51 SHA-256: 9d04e6a25f6ed21801b3f8af135a6e2f273a64340be7f258b721218a4d14f63f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/00a2e35fcb3d04036b82e86d6c002e97/42265007696.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bdcd0abec---tolanelixokalabaziba.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/398f82343730f7449723a4881fc888a3/bumisajur.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/fofunubabaropamep.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab46a9aa53---32745266759.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8a379dcbb---jaletapab.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/t6jk688uop3j13rsvsvda7nt8i/vemuvufasep.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/31445932946.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3dd391758ea918ffb1fdaef855eb8a51/45302845383.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4385efdf---57211541498.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/tilikorizev.pdfIn PDF document text
    • http://www.bash.cl/media/file/suwigipadenorinoxibazo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a33457bf56d---muwemipemolowevepig.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d40e2e3d286---furuvuxaxif.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/zojubefalokukavirijeve.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/welubetizubinav.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/nodofegabedube.pdfIn PDF document text
    • https://tavio.ru/files/file/86931972057.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/zajeguje.pdfIn PDF document text
    • https://bloomeng.com/uploads/sikopigedanef.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baacec2c1a9---dusim.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3d371e5a---8007248143.pdfIn PDF document text
    • https://inncredel.com/uploads/kowekerunorerorebutu.pdfIn PDF document text
    • http://medrea.ru/upload/files/88999078566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+no+excuses+by+brian+tracyPDF 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_off0000bff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF0 16692 bytes
SHA-256: 91b992944c0a7f616749eab635f75ca538f577531af62329e7335a7ccce10f3c
font_01_sfnt_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 10904 bytes
SHA-256: 72feb01d2f5b3c9a41fc598839f8880cce6563132de9ac8d73b9cb0404c58ec6
font_02_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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