Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c2959f985d5ec6…

MALICIOUS

PDF

77.2 KB Created: 2021-10-09 07:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: eaeaf86e9e022c01f58e6dd9c5c64a0b SHA-1: 9d869c240dba50cb884730a09156183c559b228e SHA-256: b5c2959f985d5ec6122389ef2e7e344e57fbfe8c7575c01e0f3d64f3d5477d72
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=best+match+for+pisces+aries+cusp+woman PDF link annotation
    • http://ortopediaszombathely.hu/editor_up/renilukaxulagubedubas.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/xosumarozebes.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/93948884575.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/38858012264.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/65233525255.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c432b7cb7a0c68ee892315ea6c32168e/44309325880.pdfIn PDF document text
    • https://aceold.lrsinc.co/userfiles/file/55496277788.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/588577187.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150979c3a8cc---gepidugutudiridewefod.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/wewik.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1613115cc0db09---palufe.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/nimadi.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/pujopupupumep.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/97524143634.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/daguxogofomarul.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/5712d6b07099e77fd19639a68c4789f6/mojerokifejubisi.pdfIn PDF document text
    • http://aktifmedya.com/dosyalar/files/voguzopajatenunaduzunum.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/5nrtbeu2ta7hetmscccqf0hclk/vuzalupuf.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/zolow.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/jewigimujuraritiwikib.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/af5o0kpevqcbvkhhtaeudvp3d3/naseb.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615cbd6907efd---nenup.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/tijuvudesenakaf.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/vufajutugazugizapo.pdfIn PDF document text
    • http://aven.su/userfiles/file/17998837900.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/julerivezadedewurirexi.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_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 10940 bytes
SHA-256: 1642dd0728106caec5993ec9d04a39927a553a2315a12f7e4ce2a263f14a7cb7
font_01_sfnt_off0000e2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 17188 bytes
SHA-256: 0858f86d3a963da3cb8aabd1239d5a96a18b037584580b96c82b69e03187ab69
font_02_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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