Malicious PDF — malware analysis report

Static analysis result for SHA-256 39776a286a46a5b8…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 22:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3cd3054a726a013c995696db4da01a65 SHA-1: 546904fc9cf65af611607cb462ad402b38046064 SHA-256: 39776a286a46a5b83bd21487dad003ffddd7b2a1a1ed8c0690d5986843e7588a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm hosted on disposable or compromised infrastructure. The primary function seems to be redirecting users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://amirmazandaranihospital.com/ckeditor/files/files/kowefedixamuli.pdf In PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/34072049164.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/tejariwumobokup.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/21651636584.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/fagawobeleb.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/kisukenuvevatikos.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/53891123912.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/dupudejipalunakezibidus.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7912bd55b39d87de1b2d37615297bd12/wukazej.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/dulixawisas.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/7656650187.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210918033622005.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/fopeb.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/rewijuziruma.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/81192430405.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/68134553539.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/51098159523.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/dggk4vtimhjcb2kv6ihnpchafe/37283094681.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/23830854764.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/tboj6d9j8smg5j4vt6ipr421ce/37553495218.pdfIn PDF document text
    • http://njxinbell.com/upload/files/61346554915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kadaram+kondan+123moviesPDF 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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE7 10756 bytes
SHA-256: e2fd767c95c258ebf1adee9071cad865bcabca1c11f997090622c1c265d6993b
font_02_sfnt_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 16296 bytes
SHA-256: a3ecab11287ff7320a64079a258e32d4363cbf762a3723da09538f5c76b5863a