Malicious PDF — malware analysis report

Static analysis result for SHA-256 a451dac5eb6125d6…

MALICIOUS

PDF

97.3 KB Created: 2021-09-10 21:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b538866164d0853f311571808343a4b7 SHA-1: b9d86da8afb9a39ad45758ed2190c77baa2f68e8 SHA-256: a451dac5eb6125d666319133b8e3eba1c24541f11ceb159637053957ca3b0980
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, several of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kamarkosong.com/contents/files/lodenotubugajemepizem.pdf In PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613260327ab39---jitosexadanu.pdfIn PDF document text
    • http://telecycling.org/files/file/fusegede.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/vowete.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/guoms8ktbu1ludrvlu8j3su2am/winod.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/pudusenivarimatikotamiw.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/67517770049.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4deed19e6---15881532445.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofagesivo.pdfIn PDF document text
    • https://webrobogo.hu/kepek/40006372514.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321507cbd7c---60732425673.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/retobumukesomatutij.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/82391210559.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/kuzevipobixagixomo.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/66413100069.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/2c576622e4ba2ed284c77ceb2859fb62/36840608825.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/mafagidawokitibojid.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wiminonidofigotumedek.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202196221148.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/57128558518.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/75206217994.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/bifenike.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/2057151806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=acronym+used+to+describe+first+aidPDF 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_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 10928 bytes
SHA-256: 5aedbc17d53320844f17518016e9420973c7fc9302a0596106012cbc099a3df3
font_01_sfnt_off00012fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B7 18684 bytes
SHA-256: c4d531dc0695eec447f12c5a948b51d0ae0da0d90e6fbc3e69903b1a7b3883f3

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