Malicious PDF — malware analysis report

Static analysis result for SHA-256 4809cf25451e63b9…

MALICIOUS

PDF

77.2 KB Created: 2021-09-14 14:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73c310d46d03560a8ba67f16e6bf75ea SHA-1: 993d697009191e8e894e3f11040c07893e51a4be SHA-256: 4809cf25451e63b90df4151841b2cc5fc23db4fc5226efec6d14151167a18e01
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF documents hosted on various domains. Several heuristics indicate these links are associated with compromised CMS uploads and disposable hosting, suggesting a malicious intent to distribute further content. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://clinton.abwingsmd.com/uploads/files/kojubegufo.pdf In PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/paboxaratona.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/65169033014.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/soroxozumezetomujujoror.pdfIn PDF document text
    • https://aromamarketing.md/img/files/wopugu.pdfIn PDF document text
    • https://mar3ol.com/Files/files/99781039787.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/56889740326.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gusokabodine.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/76972679328.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/br3l8qim1rpg49k50n7vcq87co/96035876609.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/bozezegoxukunedi.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/47879772460.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/kixojivukew.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/15080331531.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/93466efe7c3e3dc7d6bda2791b2b6065/gitigigekituxetu.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/boxagute.pdfIn PDF document text
    • http://exima.kr/userData/board/file/30602697404.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134222c9523d---tunepoxelumokedoxajinemo.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/88217598715.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/viresedakalolidowon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=boruto+naruto+next+generations+ep+192PDF link annotation
    • https://twitter.com/narutototoBoruto?ref_src=twsrc%5etfw%7ctwcamp%4eechebeddedtimeline%7ctwterm%5eprIn 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_off0000c367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 19504 bytes
SHA-256: 4bfe9b3e8acb1964fde28ba606fb593eb1acfce3ee12a7187efbf2d9cb030f1e
font_02_sfnt_off00010d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D92 10976 bytes
SHA-256: 5f0eeadea98521bcb9182b1a5d529384601530a055f192acece6db02de629832