Malicious PDF — malware analysis report

Static analysis result for SHA-256 89982b501937a41e…

MALICIOUS

PDF

98.5 KB Created: 2021-09-05 13:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2eae28c7131acef84105da8d02b96238 SHA-1: 9c6e7f81ffefbd4000e630a9d0c0f9ea0007817e SHA-256: 89982b501937a41eb284e0bf24591909dc1021af9dd4546562007054634f2b8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery through these links. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9712

Heuristics 7

  • 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.
  • 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://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2c6464039f6d559b914b8d026f97b3a7/bewibu.pdf In PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210702_121112.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/80111405954.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a17ff671fc8---38911560583.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d69f459926def1f3734be82580992a86/42235269505.pdfIn PDF document text
    • http://nemalipics.com/nawafivujil.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/64832214291.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/60842153675.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479ea83377---32468265008.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127823670501---mesalifabinonotibu.pdfIn PDF document text
    • https://advik.net/userfiles/file/81741226302.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/memiwikofek.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/46642506410.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4da82ba8---34867767803.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612d398e0baf4---92143009665.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/14202502701.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/f707dcca5d1d90d3637b9656840dfb94/23541357846.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160967610c931e---44549067868.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/mogisuwim.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/7fc21f7fa7baae925ca64a5f6a2937d8/mokowetujigis.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc39ab5358---zolezenozadogo.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/28437691136.pdfIn PDF document text
    • https://esz.jp/img/editor/files/rapuzi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1610b7016e3c27---gefunazugidivinutakorufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=%D8%A8%D8%AD%D8%AB+%D8%B9%D9%86+%D8%AD%D8%B1%D8%A8+6+%D8%A7%D9%83%D8%AA%D9%88%D8%A8%D8%B1+%D8%AC%D8%A7%D9%87%D8%B2+%D9%84%D9%84%D8%B7%D8%A8%D8%A7%D8%B9%D8%A9+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f214.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF214 25884 bytes
SHA-256: b248f094101a230b6f2306276d450bfa9c5eb842071f197e045c3654c1479632
font_00_sfnt_off0000d298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 19160 bytes
SHA-256: 4c1ed3bcad22771e4cc96c66ed0d5e9683c8673135796a1db2a05e8f26409269
font_02_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 9540 bytes
SHA-256: feea727f7d5fd0dd63a592afeaf838fd4c47e6006ea3b94c3301c2202a0131f5
font_03_sfnt_off00013426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13426 24644 bytes
SHA-256: 336c6c72e6d361a5c04a58f6c997a0d846a2b5570b3981f759b806160a2c69fa
font_04_sfnt_off000170ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170AB 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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