Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b72f01965aa444…

MALICIOUS

PDF

110.3 KB Created: 2021-09-08 05:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 801a3cb494c13a783e2d4a2c97a5c17c SHA-1: 1aec00730e0e66d250fffcaa9f936f48ed71f973 SHA-256: 67b72f01965aa44400f70b2832fd3964036fcc72902c2e0ef2b80e0960ef385a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and URL distribution suggest it's part of a campaign to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://gsxr.hu/userfiles/file/76575845653.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce8e396a79---4652632893.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53ea368008---99483617823.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/xumegipewija.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/neveg.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160762022c4ee7---laripuwi.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/zovatazozanexuxi.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210826_78A6D49279094EB8.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160843f2636735---xilozanif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b291dd93b1d---mosemifefegezazekekotup.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/8160354656.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/tagisazeganavata.pdfIn PDF document text
    • http://skupka23.ru/upload/m/volozivabisogebot.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1ba41f0f---17989073792.pdfIn PDF document text
    • https://ms01bet.com/contents/files/77905458489.pdfIn PDF document text
    • http://mariancozma.com/_user/file/57823123962.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/60866574865.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c79957d2893---lijowezozofolibudes.pdfIn PDF document text
    • https://nevisnews.com/userfiles/71915684105.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f662a7937f---javavulexavatixisurisefaj.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/63428206535.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c85e4177---sewimi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea77e92a8---fizakexafowilox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=flashes+of+thought+sheikh+mohammed+pdf+free+downloadPDF 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_off000140d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D8 21188 bytes
SHA-256: 247573f43faf7f89a63758cfd2f4fcca94c07a0afd99212b2f12f6b4f2ca6199
font_01_sfnt_off000178d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000190f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190F0 11200 bytes
SHA-256: a5bfa844fd4d40297dd381b99f15b439dde0675de8c03368125b65a7472ce94f

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