Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ceb363d3dfc4d34…

MALICIOUS

PDF

85.8 KB Created: 2021-07-06 17:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 838186e0ebab86d4f80e1493a5b5244c SHA-1: e8a9089691215e23ce4c295c97377c348624e946 SHA-256: 3ceb363d3dfc4d345320b3d9d7df11f00b2fd41c6b378802fc4a02898b5480e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://visionbrindes.com/admin/fckeditor/userfiles/file/banetawasan.pdf In PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b9e10124693ccd0c7206a8b463035a7c/85383027787.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/tagipiwe.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/rogukujedatotimedeguro.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090584dde32b---69930842490.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/diridojip.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/79760235475.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/al3a80loqj3i0bh1p60a6sioj9/lulilapedoviraruduzamomob.pdfIn PDF document text
    • http://spencerrandlefamily.com/clients/864257/File/sesoxuvebarox.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/30325466355.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c1541c0de6c68a0ea6d946fa29ce2f24/63764174739.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad050560a07---37559853858.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/pepefosu.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/vizasirafavumetatefin.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/6richbgvivcd8nmlcpbo25ul9o/xenujurajisu.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/razilomuwilisus.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/22594e4d5a2b28ae27a924893bbb855c/kuxixotimebepa.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9c6f0187d---lanowojugonejigev.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3943d5062664802510a48b3562d4fb27/rovajejonepebaxil.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/17d2ab3a0d2763ca4ac9f91decbf525d/41337530655.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090786808daa---kolavojikatenex.pdfIn PDF document text
    • https://coevent.ru/upload/files/99193226306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=seven+letter+word+beginning+with+vPDF 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_off0000eb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 17808 bytes
SHA-256: 3fbccb67f7a5fba700bf66c90969030f6f1f707b411d769c900193af108a6389
font_01_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13266 10564 bytes
SHA-256: ef021e6589f53e36a7720fd1ec24a6eca6218cbca81e406efd75f3db7dbab050