Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a2555e9d2a911d…

MALICIOUS

PDF

87.6 KB Created: 2021-07-01 22:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 177e42fd1f7b5059e598c92c60cb2eec SHA-1: 1d3de75daa5e03ed17501720cd60a15fc0d90f8a SHA-256: 49a2555e9d2a911dd59e39678eafd18b1dbf9b1e302c8998e5fd3c2eae56623a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://verkaufs-akademie.com/userfiles/file/tusibidenetafojipas.pdf In PDF document text
    • https://scriptdd.com/_file/file/47629458985.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/cc153a644baad85c2a4af19b9bfaea4d/wojabafegafaxodena.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076335c581a3---54020127405.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e07cdba1ab6ac784bce7966183d87336/26498478138.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607482ed9a6cf---vetajaligozelov.pdfIn PDF document text
    • http://yuha.be/_files/file/vikixaku.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/lagelfvepb51uimi66pbs08sb0/84754211532.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/44885433919.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da01dd8e722---52423663074.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/fee41c721c2a10939f732c9b38981977/tajudinozojobi.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/58140401435.pdfIn PDF document text
    • http://candientuvibra.com/images/file/59321566695.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4760db3f1b---80496846188.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/pumigipajar.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b92b3a4898c---gisaxejaresep.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607640aa16377---62547347208.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/3114255426.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb24dd9fc0e---lalakamukilotesel.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/muxusokine.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6ba88f9f---luxefimoxoge.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160909f2c55fa6---75447294808.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb70c0ba9---82946988958.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/99473581930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=forgive+others+as+quicklyPDF 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_off0000f0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 17404 bytes
SHA-256: 3a3b1fd567968e989513e9c3c2ff7dda8b0d6b3535ee4d4087be1afc6d2dddff
font_01_sfnt_off00011e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 10900 bytes
SHA-256: d218ffb7333bb009d66baba15984b9acd18baf517edcd7ed324bf22ca6dde130
font_02_sfnt_off00013787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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