Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9eae3fbb9b271e2…

MALICIOUS

PDF

73.1 KB Created: 2021-09-07 09:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0f68df24238cd179d9b9b06b1670c5c SHA-1: c0c839d6233ea037484726040cf27f53b945f0d5 SHA-256: a9eae3fbb9b271e2883e9d4959572f2ac7d57d51d992633e752bda276a956e7f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608208347eafa---96269739528.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/najiwamagem.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/63388830401.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18062f6a3---vutixasideluz.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/80240783057.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b06026392---fopajelora.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/fexugewosogidikixofe.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/lomosew.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/dipugaxotosak.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d924e7c09---xotokumivagonomuvabir.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/jitirativaliwisonus.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e81b08592f---nuwufexineduzojeselini.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607540a484e57---zunopawaxawitupevejupu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/2fd331dd3023539a01a01c1bafe3deed/fupebupareluvavep.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/78152956241.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/4739874031.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7656be8ed9---podegusudepononufug.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/611746ef94e19ebcc444c79260eb02f0/jozonojomuv.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbab9b71cc---gekefajatevutomojarizedo.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/rutazeliresi.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/57808693134.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5704b4ee1---49771029807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kathopanishad+pdf+marathiPDF 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://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_off0000b7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB8 10576 bytes
SHA-256: 5aec7094cb5abcaa7d428e012a1c44d15a2887ebbd00648830278102e332e1ae
font_02_sfnt_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 18448 bytes
SHA-256: b532e1529fdf8ef3463ab47a1204f0bffc41b9c24e2224e7a9db43d5d872cba3

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