Malicious PDF — malware analysis report

Static analysis result for SHA-256 446ab09e1525c38f…

MALICIOUS

PDF

95.5 KB Created: 2021-06-13 23:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3974f850b95848dfe451bdd91793552a SHA-1: 61eebda9b0bd772350586f402b31deeaf5522956 SHA-256: 446ab09e1525c38f90c93739375534da57172debbf88b23e88e0d2bec5784100
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the heuristic firings indicate a phishing or malware distribution attempt, masquerading as search results for song lyrics. While no scripts were explicitly extracted, the nature of the links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://coretry.ru/uplcv?utm_term=hank+williams+jr+habits+old+and+new+songs PDF link annotation
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/86f48ffe5dc5954772e03c5cd681e8df/vujawodilirupetifus.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16090979b60674---zegilumenufedidik.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/78714fa28f4e78f6f33b66f60141e6ae/52492400627.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6169d0c27fb1a324b045543bd8795942/30009220237.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071b56ab624a---sakovafa.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097b032905d4---dibotitorerogosugitadok.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/57449517998.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1609105eb04299---kakizivixanatifaxabopag.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/fodekamazir.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c11147269ab---76348429482.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/bukutotenanaxaxigaxus.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b1988ea1---sibavugarojazopatusomevoj.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/savufirefe.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/73d8cc9464c5477d8ce29a2fcac541e3/kexomolixodavonof.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
    • 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_off000124a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 5572 bytes
SHA-256: e0d7fa8b7cff351fe80e930dc1f3f55e3f86a027a81269b493dfbedcda956c7a
font_01_sfnt_off00013780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13780 10484 bytes
SHA-256: 21551ad6aaab70a88d789cc6c3f8800405cea00defb750626d0a445b480140c0
font_02_sfnt_off00015b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B89 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15