Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71f153bbeb1f53c…

MALICIOUS

PDF

67.6 KB Created: 2021-09-27 19:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f34f5c6fb95394f5ce02ae58bc804dea SHA-1: 51769810036bc08f574205c3f2bd98cefeea91c9 SHA-256: f71f153bbeb1f53c42034799e5c199fb9311014c8ae11842cb27b7697ab66f76
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiopignotti.it/userfiles/files/rerilaxafix.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab740981e---gajifizovelowiru.pdfIn PDF document text
    • http://artospace.com/pics/file/43768856441.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/gojujagatajaramafidosal.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/34167346808.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614559e7df1ce---99477995741.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/degafefiwigokunozozesa.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e13a84447b---4894093873.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/dufasovuduzijefebaj.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/dibopivaxerujevirado.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/vagaxonelesakupiz.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/walususerijuxobipowil.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/96501789329.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/ririfexawigijitasaxi.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/96cf2744ed744203b6289125073aa4b7/20539846662.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/zifanulusokilevutodobajax.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210907133355.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/xezabevizinolifawabor.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16140828bcbf5e---roluzulimeveduro.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/jegerebogubir.pdfIn PDF document text
    • http://someteme.com/archivos/_20210927005347.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9c445dc04ecd465c50dcc47ea6a63823/tisozujeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=healthy+fat+foodsPDF 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_off0000ae2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2C 10260 bytes
SHA-256: d79f5f0295ae7639d692eeb25a670d07970ebdc203fa18a8c9a1f25da737b1b2
font_01_sfnt_off0000c562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC562 14412 bytes
SHA-256: abec2daaaa27b8a227a27738d991f1e31cd4a768afdb9bcde1ac282dc99fb2f1
font_02_sfnt_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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