Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac1aef48eed894b…

MALICIOUS

PDF

93.0 KB Created: 2021-08-11 06:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: beaa3b321d75cb8dca4112ca4d9dc276 SHA-1: eb1fe260e69fae00b978f3e11d9044669cefdb43 SHA-256: 5ac1aef48eed894be8cd33e8c77a4539aed117b815b29b668a5a42ee1ddd16e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of embedded URLs and the overall structure suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef67a9438c---pesuk.pdf In PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/69785348382.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/564f3ed93e7479656228e413fcbcc677/belobazudo.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/popezaf.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/miraxinufas.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0c0ef5081a6f36d5f3fd1fa076d4d484/38349193830.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdb29d91e0---vilolugakumadib.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/cba8634ed10858647bdcefa2bd326570/89837248038.pdfIn PDF document text
    • http://wernitznigg.at/files/50363874516.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/amuaofkd9s70kju5imtnj25t03/33816278400.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/13615309239.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/53589930079.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/tepunumetumo.pdfIn PDF document text
    • https://777mto.com/contents//files/33099203497.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/laletezeviwules.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/tejisavose.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16089b41b3dbd2---kagigunizolenizurimasid.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/338a978559476734e1df9cf624484c24/28932077619.pdfIn PDF document text
    • https://securitydm.com/slicice/file/gamadi.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/25036898982.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608531d49c845---72433669894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=software+test+plan+template+excelPDF 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_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 16772 bytes
SHA-256: 83f5ee3294dd63b557e10888efbc7b60eb0c6ed8b35e0dc4d2646b0bd8932e61
font_01_sfnt_off000135a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBD 10812 bytes
SHA-256: a03b0d5621126acfd4575f3221e54160142b2a2045ffdfdd66dbca185c479d50

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