Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf30bb692448ca14…

MALICIOUS

PDF

67.2 KB Created: 2021-06-21 19:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cb06aa554fa13f3c253b587913fe6198 SHA-1: 78134a4a7394de579733e126608bdf2e34929d7d SHA-256: cf30bb692448ca14863ba8bab9b3e73a33dcebb5e18cb22d937fd54fd34ddcc1
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to potentially compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is a link farm designed to lead users to other malicious documents. The presence of multiple distinct hosts and a high number of links per host further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/gilawurukuberaxuma.pdf In PDF document text
    • http://4bzsoftware.com/Images_upload/files/76141965790.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/02e79e3ead97ef34a81b8fe896299599/57948516263.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe9579d25f---gibavudeker.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16096c0497d3f0---visiwiretabozeseni.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/f1ts0u20eh9ebrfp75anm36fna/virekobapifenejerag.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/fidasewewud.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085e4e8116e6---fubaberobatokobene.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609873788885c---20657614231.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/9kf2dt5n6tf2q1rddhob51d169/kudamorevagemedajawa.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/82171470855.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6d0m73g2967mfgmvchdmdodo3/25338214519.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44a8dc04d9---48820273971.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56cde24003---bufari.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/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=paper+io+mod+apkPDF 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_off0000c279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC279 4960 bytes
SHA-256: ed46371256468cbc20bc872c7adb7007a4a9008393027bea9350d4995abd8fac
font_01_sfnt_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 14524 bytes
SHA-256: 3a2e5763b78e4deb539beb6efde8e395ebfdcfc03ea3d9f05a9b08dd7cb85c0f

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