Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7caaabe30f2439…

MALICIOUS

PDF

73.9 KB Created: 2021-09-25 08:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5288a594b33b7c3fff877d0feff17839 SHA-1: 1fe1f1dbca6e4f415ca4c6d8569e44576b15e9d8 SHA-256: eb7caaabe30f24393d46e58c15b370d8e5251734a974ecaff6bd9ea8d0df1c64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. These links are structured as a link farm, suggesting an attempt to lure users to external malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c5eb98a7---fowezozufexofutezadul.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5f3f9e7be---ratix.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/50172579304.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xelufubida.pdfIn PDF document text
    • http://emailchopper.rockeit.com/userfiles/file/tulojovi.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/dotigo.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/busapamenekafokizen.pdfIn PDF document text
    • http://rapet.hu/files/4244203946.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/137648520.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/wewizajozebip.pdfIn PDF document text
    • https://micsys.in/userfiles/file/mipinafowibag.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142256ec1647---18272113430.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/0isac5j6veb3lhm4tn7gb474la/26328098109.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/84081266836.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/lusawujikupabuzaf.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/37166768346.pdfIn PDF document text
    • http://canoeing.by/pics/files/teroraserupubesimapugebor.pdfIn PDF document text
    • http://vucert.vn/uploads/files/nojujazada.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec0c31e65---30690383993.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/litorewuvovudaj.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/97632267845.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/zixidadapez.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140285e07712---59962624324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=open+source+android+mail+clientPDF 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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 10800 bytes
SHA-256: c9be011d1374ff30d72ee3f8d1b918789440793274aae1ef7f8ce04fe96c7646
font_01_sfnt_off0000cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 19816 bytes
SHA-256: 864e50f8bada456877431e253ef8d8e28c83ce7d9625f9d1cbe98acb23bf19fa
font_02_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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