Malicious PDF — malware analysis report

Static analysis result for SHA-256 32690eb0e41790d8…

MALICIOUS

PDF

68.7 KB Created: 2021-10-01 03:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fd46a72b83b4c3376107b359602926ed SHA-1: 63bb8f1f1aaafa962830365611c11f60a869aad6 SHA-256: 32690eb0e41790d8e53496c57a00867484eba07b8d6dd0ef96589a2bb446862d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple PDF-specific heuristics related to URI and link farms supports this assessment. No scripts were extracted, and the document body was unreadable, but the link farm structure and heuristic firings indicate a likely attempt to direct users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://kbautotech.com/board/datafiles/imagefile/12085856103.pdf In PDF document text
    • http://magnumprint.ru/upload/files/nerekibom.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/soradefejepoxapijul.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/sipururosodukiwaji.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/78557681597.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/sulul.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/25820516804.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/ronakeraribimuvodotive.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202194145212509.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///40108856709.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/61711015994.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/88dea1285fda9c713e0832bc88d6e39a/26900334098.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/97343784335.pdfIn PDF document text
    • https://avflash.nl/upload/files/nefefavananidajej.pdfIn PDF document text
    • http://hocomesun.com/upload/ribijel.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/9ohqaq174njc5j067ltseva3g7/simojididalovita.pdfIn PDF document text
    • https://shreeaksharinternational.com/webroot/img/userfiles/files/59750954699.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/69507107687.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/85042625374.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/jazes.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144de831c9a1---xigenut.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/gopafivemekegigufarojek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cool+goal+mod+apkPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/loladoxat.pdfIn PDF document text
    • 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_off0000b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 15144 bytes
SHA-256: 2c297d5d3a13dff68ba836317f3bd873ede1342bc25084523ff7128d4a76c28a
font_02_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 10164 bytes
SHA-256: e8a17a7008430087ccd939907d802df4456aa8f7256cf50434424e0d677b9d96