Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db5459364c2b4c1…

MALICIOUS

PDF

80.1 KB Created: 2021-06-19 02:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1c615a6810a94e7b1ce317d4f6fdbd30 SHA-1: 933a3c20b88a3662776cbbd190d9f34e7794b0e7 SHA-256: 5db5459364c2b4c1ee025def39720fd0d331341725e950e1041101b0e7429391
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external malicious sites, likely for 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 http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rkmgdbq7uismcqoadsq0dnjns6/volevigurofijidolajof.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e18e8deb8e0fdbe440fbbf1a43e38ec6/91663297069.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/sugopu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/18244675a00530336bea9c8f53575df4/fatejikajilagik.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jalovoje.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609943d5468b4---subowexer.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bixisuretarinazuzufebogip.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7gchk3mj7kpvbea30loocio8r4/zonaxumabew.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/bbfbfb0aac5402a9e98971044be75e1a/83601543077.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/25828686261.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/39c74ad8b558d64490ba9e233692cbe1/gizakipafi.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/49997332937.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/47875a6fcee219250b80e15627d895a3/36299038523.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210528_142058.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/miwimifekotogirego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=example+of+compound+complex+sentence+in+englishPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 5496 bytes
SHA-256: fe381a99979499c31192faf9d33629287594eadb33a489451fd57128285c8204
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 13672 bytes
SHA-256: 63eb74c6dac24c1370f1b41e14764d0dcf999e8dda5afe2b1bf258eef2113d92

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