Malicious PDF — malware analysis report

Static analysis result for SHA-256 61af7ef84042be90…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 13:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be5837ba5c82beedc31e199e13624826 SHA-1: cca17b6e6b4986bc9dfa1dda8adb821249ae2731 SHA-256: 61af7ef84042be908e96ba0f1f2a7c78de5c965c7bb95e760bb7e08712081e12
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=como+aprender+ingles+sozinho+em+pdf PDF link annotation
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87bb5727df---lefasodemonepiso.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c833ae0ca5---kofidifujufutewowafopuwa.pdfIn PDF document text
    • https://atlantidegattico.it/file/26353696039.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/44579262874.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077908facf86---fuzuzatazisokolabusazogo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/jk6nduiaiaooqat9v3ubhi6dm4/kezarawedidoxopugaseb.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/1961920d1fb8f038ac2e2efd22d7c288/fatiwujakalup.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6e889c253---pirodorelaxalaze.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/magepubokipikizagok.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/19521616864.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/72670214510.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/de86dbdd20a19206b4036edcc8c33518/10402486326.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/renidivejosajilaj.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1747d9cb2f---petire.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/51473112105.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc2ccf9d4---525394722.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/podasipewarixebonu.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/dusunatoloparidatajuxos.pdfIn PDF document text
    • http://tochuchoinghi.org/files/xewawonugagiwebazuzilona.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/jiwasidekekidip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3a11ea4e8---zuberuvuvujoxules.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/7743960020.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8a72dbc5acc5b04289652a615e24c345/vopurefedopurelewoveruwes.pdfIn PDF document text
    • 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_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED19 10940 bytes
SHA-256: a55a3cba96306b59c3412749bc3bb7201ec283845eedf8265a554e4c8fd04eb0
font_02_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 19176 bytes
SHA-256: c35b560760d6f299e1e4bf804ae52e97b251b6009e1094743f3a4f6f0f7de9b8

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