Malicious PDF — malware analysis report

Static analysis result for SHA-256 5648f0aa23d7a123…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 02:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b319fa810150fb666b935f17018503cf SHA-1: 0f393a9dcb7fc758c87f6d5c56eb9e1bd0fd409f SHA-256: 5648f0aa23d7a12343bcd79da57bf2a4a4a8026a90b38d31dd5a8c92d08f6f23
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://mijn-nederland.nl/userfiles/file/24677338026.pdf In PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3de439d73608975c5798938933e2bbdd/77151645031.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160997f658895e---8910345322.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/36088556099.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e93cb9d6e7c---95880209654.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/xakibirotajogukos.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/56959059843.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16111b221c5c1d---4244197676.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/poketob.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/tizis.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7f133c83d8d0881e5b302742c3bb1f27/gisegowurugofan.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/lmsptv74nuti96hr2cegqj86cu/xorugujosimugoxeganisun.pdfIn PDF document text
    • http://z500.si/files/zesusaxanuzado.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/mabirivovatifegegaxagapo.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/65389751675.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/tonokaziw.pdfIn PDF document text
    • http://vejwun.cz/images/25957739045.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/dkajb75p50lh35srv0g9ppc4b0/rapituda.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/49c4817cf1e1810bc0f09cf9a3db9bf0/kutisogobelenidomupa.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/uu81uvkmq4915ilp3kcr54icn2/zelugevoboronasi.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db43b5b2eb7---76041871361.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b21c7ec7cf8---feporovisevedopajojipeju.pdfIn PDF document text
    • https://cncunse.com/d/files/32778199697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+time+in+12+hour+clockPDF 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_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 10852 bytes
SHA-256: 8967193f81d42a505f2a850163c1d881ef624d7c65509d69338dfaf5acd6763a
font_02_sfnt_off000101f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F1 16952 bytes
SHA-256: 003ddf7397b97406bdea9599de4603e3cfeaf47047ea4d69ca6a66f8cb7d3130

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