Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea342d0cdced943b…

MALICIOUS

PDF

102.1 KB Created: 2021-09-17 15:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d213383b5b44f189fa8d02870964133c SHA-1: 9088f9fb46c1230659d0bf742af2caa06ca34b47 SHA-256: ea342d0cdced943b2edb2fe3437c938a02516758dc4071d04e68d765584f609b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://nirmalapublicschoolerumely.com/userfiles/file/23182917193.pdf In PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/50412156394.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4163860985b964ae81a818b44cc5e90f/sebiginodexos.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/fexikirelikisikukirig.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/9531c6be4fdae416f9ca8b016c15c2f0/mogemulupinemofutudiz.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7a9ad126---vunuwol.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/99005487994.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/94282349354.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/jaxidifeleniwur.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/zariveruragibefomuf.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/zuxogikafuxanadig.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/60729912776.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614387508942f---45530858755.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/luvagajejakebemotow.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e4c9bd9dfcfd62ea9c2eea80e0c9f714/47135067195.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/sejazerojekesi.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/26704124533.pdfIn PDF document text
    • http://pronobile.com/catalog/file/somosireliwug.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/lalekavitodoko.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/nomidejizudukiw.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/45939777038.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130b04879102---36266144434.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210901065326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=corel+draw+x7+pdfPDF 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_off00012826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12826 19356 bytes
SHA-256: 5e4795805d6b1f7b055f631019fd0749c10174f7fe9438b6c2a5d42959ccd8fb
font_01_sfnt_off00015b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1D 10300 bytes
SHA-256: 8a83ea19c909f55241314c74dfeff4482863fcbd2d3f8c826a0a7dd12c956c45
font_02_sfnt_off00017292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1