Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d723487bfc02d24…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 11:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 884351f6f5c691c4319f4af8a1c4f94b SHA-1: 82c0b3522b9f6947251da5819bcc55da4d7f6593 SHA-256: 2d723487bfc02d249eb3f31d6c454df3d0254d4eef2b61a48a4a329508197993
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://worldmedglobal.com/userfiles/files/nopogojutivubadudavu.pdf
    • http://travel-door.com/userfiles/file/35827117031.pdf
    • http://baby-daycare.com/uploads/files/202109151022188645.pdf
    • http://nineslash.com/user_file/file/5330494602.pdf
    • https://mimzyonline.com/userfiles/file/76487409286.pdf
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/75702042091.pdf
    • https://batdongsandothanh.vn/luutru/files/76582800233.pdf
    • http://1544-7419.net/upload/fckeditor/file/vezosevo.pdf
    • http://studiolauramoschini.it/userfiles/files/4707613016.pdf
    • http://gradn.ru/uploades/fckeditorfile/girinexavivupiwumigas.pdf
    • http://open.ua/uploads/ckeditor/files/xijilizugaf.pdf
    • https://rails-bg.com/fckeditorfiles/file/texoras.pdf
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/netanipisogi.pdf
    • http://fonnepal.org/userfiles/file/dezokuparupegilelexa.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f02f951b3f3112ab46b6aef8df8b9ee6/nuvifopemikegimedijitig.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361cc70bed8---xevumowaduxedok.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16155b26fb8a4a---jefazezafowi.pdf
    • http://tiwtactic.com/userfiles/files/63889308806.pdf
    • https://sangolongphuong.vn/longphuong/news/files/7237352696.pdf
    • https://familienbilstrup.dk/ckfinder/userfiles/files/75230945668.pdf
    • http://fitviewer.com/files/file/87437138250.pdf
    • https://ddshower.com/ckfinder/userfiles/files/48492363096.pdf
    • http://kammed.com/userfiles/file/puvifirise.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/18991601873.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=march+horoscope+sign
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0c9.bin
21b0f4dec7023dcfedf2271d7acc42a049f491b8cad429d97459a228ad185705
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C9 10504 bytes
font_01_sfnt_off0000c89c.bin
ef676bcc6954a4549065167a8afdb72972b452d4b08e2495a6e1ac98fac7229b
pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 15828 bytes
font_02_sfnt_off0000f087.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 16792 bytes