Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c70d131525ad4c7…

MALICIOUS

PDF

74.6 KB Created: 2021-06-16 22:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4c53d7f15d6ace2499a5f70c89d3dfca SHA-1: 7e11293411cf6da167d624db445b54e944196caa SHA-256: 0c70d131525ad4c7fdbd253cc3d56c69ceed8b38cfa693cf005a2ddb149d3d2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pistant.ru/uplcv?utm_term=christian+song+mighty+to+save PDF link annotation
    • http://kaitosushisb.com/uploads/files/rajulowuregux.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/tozigulawur.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16091fa704b143---80009837346.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/54873449457.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a4432e63c91e36721810c41faf561c46/51631549562.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5c486a3323db2e7c77187c7625df984c/wowezupaxexojubusopakiwem.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074200118f5e---13788014400.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/lejejakuvalapipudivawubav.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7ef1936e03c05312c86066e0f81a67a2/50146916757.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/zasabepagegeletuvuba.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/086c13dc162668d90001ef0cefbcb8c8/69622903393.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076203119dd1---kebavefewerajusugixagudo.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/wegabowuw.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/50314565038.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609460c4562d8---nokubafizobamexu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986af2e19df---pofalizugazi.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a016e4c041f66bcec5c2867d75f78ed/57700232037.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 5132 bytes
SHA-256: 5230ec99da39751716f017612fe8bf544a809d887a7e4a2db439c06cb53f51d1
font_01_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 10728 bytes
SHA-256: 151c71878ad0c0da570421b0121f17728e697282a540624bcb63e53defeceb10