Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f26cd8c2ea4ebca…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 14:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b76e78ef642e239da42bb69982bb54ad SHA-1: 397a2e36e2296d3e4290ecb8af6195cd70d9a766 SHA-256: 3f26cd8c2ea4ebca977af223cf2435e14b148b73ed30e2c4ffb7afeeba25e7ea
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://globaltranslation.com/demo/global_translation/beta/userfiles/files/86468260967.pdf In PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/17262387503.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/gufamufebidego.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/powuzutopopovupopariju.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021912544167756.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/1fd1a646f99ab303730c131a531a1243/raziv.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b677c0ed5---91301536528.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/66742829555.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/ruvobetake.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/vogopeboxiluwib.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/moduzewozut.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210912031902_39975118.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/82852706328.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/78800343120.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/zepemajotufifuriromubabab.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/96120094766.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/65873293298.pdfIn PDF document text
    • http://capital96.com/userfiles/file/jopokoxuwo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/95de53482e462a7bed91062ced828d18/8147814808.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/62554253969.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/mazesibob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=configurando+email+locaweb+no+androidPDF 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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 10912 bytes
SHA-256: 75623aec8346f1d834060958ecfffa882c170ffd9ef6da4131e51901da1f1c92
font_01_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 18484 bytes
SHA-256: e8011e0fd09c0049e2c92840f23bda60aa0563f354f551ae7cca469e455f1241
font_02_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1