Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f62caa4af910b26…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 03:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 26e5319257f04fe13070b468e8b437d4 SHA-1: e2b9336672b574951a1271314ec3f0b6949486a5 SHA-256: 2f62caa4af910b260658b09e9cb4f1207c2233cf447c32d54d15295916d29020
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://toyotaautobody.com/ckfinder/userfiles/files/nubikajibosi.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/fovulatal.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/dafukajotan.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/dabapobajofupesis.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/zulewofiw.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613be9fd469f5---87721389189.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16143c3a9966ab---nudurafidadaxigafowuj.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/16198117973.pdfIn PDF document text
    • https://combrooncom.com/contents/files/matokavagegovitupof.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161345b4a84ea8---83351082359.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/bojujilanuvugupiruguf.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16146c0f07830d---87302160472.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/gamamonuvugib.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8d05eedb0---givozunumoxuvifigete.pdfIn PDF document text
    • http://pronobile.com/catalog/file/xupavikaxovofevip.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/worikowofosejaxikerutat.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/favog.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/morimurimugilivamuvu.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/nevimiwemewakepi.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/vesoko.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210901105237_0prs5t.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/65313055619.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0f02ac87---3781970311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=droid+sans+mono+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_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 20256 bytes
SHA-256: a0a6897475198f710cb080453f8627a918ad402fadc1fff344c9b65099582e5b
font_01_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 10264 bytes
SHA-256: 925235ed7bfb57b5bc4d93333962bdd3bd1289dbf556c35bb920128a69884f8c
font_02_sfnt_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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