Malicious PDF — malware analysis report

Static analysis result for SHA-256 403775ce9207a6f6…

MALICIOUS

PDF

88.6 KB Created: 2021-09-18 03:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94fa8ebbe527d739f99afe3c522b3dbf SHA-1: 045af12761bf54a7d7607027e9a0047ed6cdd1b6 SHA-256: 403775ce9207a6f6dd8f5dfd420e30505c2d7c72bd1120442ecc7a0cb4a7b5c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external URIs and link farm patterns, suggesting its primary purpose is to redirect users to potentially harmful websites. The presence of multiple compromised CMS upload links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://uzunlarpeynir.com/dursun/upload/files/ximagefajizuvokeb.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16138a08f56af0---nofewokexerovikatujelok.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/98870803335.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/xomigofuwudojusu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6bfec1ca3---97482251607.pdfIn PDF document text
    • http://indikino.com/ckfinder/userfiles/files/nikad.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/55944238873.pdfIn PDF document text
    • http://dsraxys.com/uploads/8415395723.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/44091235100.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/woperunibuwix.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/rujidelesilevinagi.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97475593815.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/gibukumozapekidijofuxev.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/tikexexumopidoziboli.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/milakaxerubusit.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/49727036412.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/74382089557.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9hai5428hl8q1vlc8deouus05a/21621870582.pdfIn PDF document text
    • http://vhshf.de/File/49124861835.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/49897478955.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/23693384096.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/51185492957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+emerald+fire+stone+cheatPDF 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_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 10836 bytes
SHA-256: 9c1047a572e276fcf7543c15bf738e24ba944be17fb604c0cbae9f6f1b802917
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 19372 bytes
SHA-256: 991849c92e62a737ce3f859507cf3f618ba428fe2cb1bc606edb22e465fb4078
font_02_sfnt_off00013c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1