Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3693365f3158bfe…

MALICIOUS

PDF

73.6 KB Created: 2021-09-29 01:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75a57fd2854cba5642c2aa3554abb14c SHA-1: 8b73dd5d9113b8ef217c139f830025089e219a08 SHA-256: d3693365f3158bfe6f8d572ac343ae928493881f826dc81a3abf9e3423f19b42
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised CMS upload storage. The presence of these links suggests an attempt to lure users to potentially malicious websites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=how+to+access+data+from+phone+with+broken+screen PDF link annotation
    • http://appartementslisa.it/an3_Uploads/file/17837048001.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/b81b3af8716a5859ece314c47a8af392/zesen.pdfIn PDF document text
    • http://shahgrp.com/uploads/9955398498.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615325486af97---vamemabilodulat.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/sexofusonejavokibon.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/labudonobov.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/4125855082.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/69961190434.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/tlvasrq665f2hffa0uie33ra99/60749617453.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/wazatadokajesosogu.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/11282770329.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/28463218970.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137666f2e91a---68254057222.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/sumunuvuwawarumutuw.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/22366657391.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/boviposef.pdfIn PDF document text
    • http://0800-707-808.com/upload/ckfinder_temp/files/20210921153845.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/gurudetaxapapokure.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/81898502109.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/waburof.pdfIn PDF document text
    • https://razredna-nastava.net/files/43666981651.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210921113450.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/83743509536.pdfIn PDF document text
    • 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_off0000b979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB979 11148 bytes
SHA-256: 07d5e18fdf479501bbed363d4d921dcd72b754514b8d1a8e0fd049a806b507f7
font_01_sfnt_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB35 17596 bytes
SHA-256: cec734f564bcf664a28ea979725d8a703bb8c6aee89102a36cd1b628610e9f4d