Malicious PDF — malware analysis report

Static analysis result for SHA-256 f531eae6c7ac2f36…

MALICIOUS

PDF

71.6 KB Created: 2021-08-08 07:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a808ddae3e29899dd03149c25b9e4f9 SHA-1: 8c2ac9769550c29f2ace8e5beb3287baef14063a SHA-256: f531eae6c7ac2f36a9bd91ebe7e224287194a626848308573fa4ad834a272c06
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of compromised CMS upload links further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=how+to+adjust+a+square+d+pumptrol+pressure+switch PDF link annotation
    • http://aapltd.net/userfiles/file/32100459137.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/95378222771.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/80056174488.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/hf1oukv939kch40kv2lndbc5a4/84259495931.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f724bc0c1f5---rixafadarit.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/tejijujadode.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/73522591077.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/nalonaxozenigadite.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f182f311e11---wosijawalamotuperunipebu.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd9b742932---47266127654.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/85168298319.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/80750196550.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/pazamajodonodatev.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610826a85d5d8---lesesewapetevivupo.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210624124722.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/fuxifijorebazifosukixi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507194908795764.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/pewodexivosuza.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/vexod.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a207aa3c2---mibidakijozopajogeve.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8cf31c822---53151135214.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/45987809224.pdfIn PDF document text
    • 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_off0000b5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F2 16120 bytes
SHA-256: dc84ed9113fc7c5650a7389d83e2c56108bfc7eb0776fa21c6f447a9c5e074a5
font_01_sfnt_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 11128 bytes
SHA-256: 9fb057c33af4dec19579232f8bff64676cca0c51d7731e168ffd4fdea83e69bc
font_02_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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