Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c2848064d99f7c…

MALICIOUS

PDF

74.4 KB Created: 2021-06-14 18:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f23577a252fabb0ba0d1edeac513a3b5 SHA-1: 0e50d9410ac0c2dcedc978e612eee224d79fc76f SHA-256: b4c2848064d99f7c59ed97e13c51656207f96c304e2fa0b29c339cced9e60fa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised websites, many of which are hosted on WordPress instances and utilize form upload plugins. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, and the presence of 'utm_term=pokemon+pearl+download+pc' suggests a lure for users searching for game downloads. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://queure.ru/uplcv?utm_term=pokemon+pearl+download+pc PDF link annotation
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079042fe7ea0---nuvajeditasazevuwumamed.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/jizinu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/bc69a765a5141f39f05069d1db690557/direlewevezagobipuru.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8e7758d92e7c772147bd742e5fca064b/zerozikigavanajowumot.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac54c910583---talasiginotubapigu.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/mixerebuvaguje.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3870f946a4f53d0be51cf0c316e3bdb0/taribonag.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c4febd9fd47---vazaxawejozafametomukabi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/641f6d528a4a26f4cfc2e161f97090f3/rodagebexiw.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/zalilevutovarimezojesum.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/jejiwuzu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/53661fd0a5e1ed59a0ac46cd5da3d4a4/gunupavaladirelu.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210506055312.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/85585386900.pdfIn PDF document text
    • https://artenika.pl/fck/file/14238402773.pdfIn PDF document text
    • https://oversaslogistica.it/file/78305443662.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_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 5196 bytes
SHA-256: 447d448a70cd0c0c10b0bd939ef9903011bc082536d806b3ce710bfb52593bf1
font_01_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 11104 bytes
SHA-256: ef1ad1489e2a1804ad570687c1ecea752ef39e6f2cbc24a8ea9f7d7b6c4378e4