Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0742100ecf91642…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 08:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1643222860a9e0246f3dc9dde52f7bda SHA-1: 7b5c11f1866a99e0b701b24c40571ae8f531a4ee SHA-256: d0742100ecf916420f86039e115d0fcdfc8fdea8a140eff66b6a6ff412174d43
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 0.9960

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://smidgel.ru/uplcv?utm_term=one+minute+manager+self+leadership+pdf PDF link annotation
    • http://stapper.de/sites/default/files/userfilesfile/65312872461.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/karowigabilusosobajun.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/82120321087.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/62405493747.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/72554916809.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/2468442078.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/19493563104.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607174bfb6261---76807808186.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb5de1168---bujokeroril.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/73442997249.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lafk3l7m8hrj44012k3312d4a2/53961862068.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/63331794852.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805ae5bd665---15926698486.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/pinepopapuliw.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/80pv3fnh6acdu8ogdkqio405t2/waxepeledugarugu.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/aodlqfsoqiu147smbaord6blcs/pilitezotugetorolep.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/ritunupemubupe.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/xivarifipiturifixu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/livaxuzizemelakabilerig.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/31301337691.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/64676683212.pdfIn PDF document text
    • http://ymy-tea.tw/upload/files/sudaraguxazudepizafatexu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098b705b070c---mexogiriw.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_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 10952 bytes
SHA-256: 15826c4851548ea4a1945f230b2bf45e0161e52c34b0bb7ad484976855956e13
font_01_sfnt_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 18964 bytes
SHA-256: 8c356348771063410374f11321b33813a79ec38495e93d87bc0de5934de1b32a
font_02_sfnt_off00011831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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