Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f497f212eb0eeb…

MALICIOUS

PDF

79.4 KB Created: 2021-10-14 18:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ed19dcd9c3cb7265de2907fc7a00f5e SHA-1: d0473246927f1644d114a7914213cba9e078a6f3 SHA-256: 43f497f212eb0eeb0f2d969dc696d30d43e86661c658ad491eb803b335d2a246
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised CMS platforms. The heuristic firings indicate this PDF is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://khachsandomino.com/hinhanh_fckeditor/file/lumafedefagubigerufuboxo.pdf In PDF document text
    • http://jlicentral.com/images/authors/file/lobaxujurijonumexix.pdfIn PDF document text
    • http://bushurov.ru/images/files/penizudelovodeforaluz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/37d00fcd026813d95c9371da6403a6c6/rixew.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/gisewofinumobex.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/38369561874.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/xoxepusozetoxabofil.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/dabowijaba.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/8695737424.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/mejiwanuzegu.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/sokujagak.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/sirosajadabunujun.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/d44457a7faff8121af96aa3b5cc76fe7/zeredebofu.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/26875381318.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/kirarekawufetixojupaker.pdfIn PDF document text
    • http://lg-palette.com/upload/files/vufiwidabezar.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/14196503533.pdfIn PDF document text
    • http://sql110.com/pic/49507911206.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16155ac19456c7---27055036970.pdfIn PDF document text
    • http://tuyendung.btccorp.vn/uploads/files/22600095142.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/78214726075.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/73283102633.pdfIn PDF document text
    • http://sfssolution.com/userfiles/file/17435593812.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/75923586827.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/UsNeCLCzgYg/uplcv?utm_term=mst+to+gmtPDF 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_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 9808 bytes
SHA-256: 7a301f6519548f60fb10d34595617124352bba3a0c0868675cdffe2ecca274f3
font_01_sfnt_off0000e8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 18052 bytes
SHA-256: c246095ded7e15b72be94fd939bca232a29f0509e11471982505f1074b55b021