Malicious PDF — malware analysis report

Static analysis result for SHA-256 704c1563d4e15622…

MALICIOUS

PDF

81.5 KB Created: 2021-07-14 05:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 31c4a576c8cc104de41dd2a91adcdb0d SHA-1: c043f4befe784b6606c121381d2cea91d1863208 SHA-256: 704c1563d4e15622327fde90d06e507160755367d6c8608016d3252d69e6a1d7
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://brightwayconsultancyservices.com/userfiles/file/87625607341.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/27vb2n7jmveleg4gh6ps8qaun7/86264111251.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/65619248043.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/pufozugawurutid.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/72004623355.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8ef5386d8---25120157288.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e82ed4580637b80ec72fbc0884e02960/91876290928.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b4a9ce2e93f49ed2a5c5ad2ad7cc22cd/gebigawuvorojavotut.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a705e7cd66---diretizidoluvepoxupu.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210625093521.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee3267bb52---sutamotazibexiwezipuzus.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/36867030942.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/wakofule.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/tinogef.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/detalebotun.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/07b6dd4962a18a24b402aa90c9d19af7/17195732707.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae9547673---fetekuvabofumed.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o54iefggvukrdjs5uobj10l8gb/72516216562.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845fa9e1f65---jugezojonumuwamenusugudik.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/muvasixekuledotafeku.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3be31cd7d---rejojubagu.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pexuwulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=william+wordsworth+butterfly+poemPDF 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_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 17592 bytes
SHA-256: 33ccf93666c3e47246fdfdbf1d80efa2b1ff2fdb5258157aefcc9a8554da56f8
font_01_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001200d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200D 11092 bytes
SHA-256: e75b1013b1bedccde2457eab4222fab1ef28967eaaba3019997974abcd2d3d41

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