Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b190036a2bf55f2…

MALICIOUS

PDF

86.6 KB Created: 2021-07-23 19:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf5b7d0634b0575c094f4f20e02a5d08 SHA-1: 8da10ef8f46b82dfe4060c039cf33687e757c6d3 SHA-256: 2b190036a2bf55f23e7c67a944ffa9393c0d66c888485ca4067048b9a26d2ac2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to act as a link farm for distributing malware or conducting phishing attacks. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://bright-inter.com/file_media/file_image/file/14339419645.pdf In PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/6d930d14b695fdf62511d1bed3637e50/94975049973.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff38cbd5b---726176151.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5951d598a46a6d58de75b9e7cc13b022/zedelasoloxel.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090d35bc091e---pusosolesipozotofesu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3cae332b6b---77770669676.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/cab58440d561012ab6dcd40e479f0275/4194683732.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609287c7ebc22---lujagaxevabov.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/zukalujita.pdfIn PDF document text
    • http://rilta.net/userfiles/files/52024677824.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160987a4f802c4---79312179728.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/nanoxokebijufikogez.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/64995457807.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/914j7grtd3p82q84r92np8ipud/37898529094.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210703_C9E29C67E7D39EF0.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9143154b---83305483704.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/79e44f04d45cbbd6fe492b19a795d5a5/davurinomoxugomukula.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/pokesagimonalivivugox.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/cf15d028d0a549862141cbbb1502cf74/39329447962.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/10158443657.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/1cdb78bbaed293911e6fa3bb631c1a92/bifasirunizeteri.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bff2ed69a---93592246795.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/79965004019.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c974e44dd70---42243537253.pdfIn PDF document text
    • http://goldmustang.ru/files/files/47699439953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+auto+clicker+is+safePDF 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_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 10516 bytes
SHA-256: ebc239e0e13e963239b68dafddc6596fd8372c5e5f2d53a59968dd9cb04a1b06
font_02_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 17236 bytes
SHA-256: fc81f75d2d846fa6d5f32a0fbb8888c6b6c421e83dad3f6440a2c2f1e1a70430