Malicious PDF — malware analysis report

Static analysis result for SHA-256 4316d1ee5805b00d…

MALICIOUS

PDF

83.9 KB Created: 2021-08-14 23:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be08239b27ad04c19a46a885378746f9 SHA-1: 4a9a8670dec95cbcc0e1f40072492ab8e5b6c6d3 SHA-256: 4316d1ee5805b00de4015b644c7e883dcd383113804ded29286ba957fcdc6245
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to external resources, many of which are hosted on compromised WordPress sites. The presence of UTM parameters in some URLs suggests an attempt to track user engagement with these malicious links, likely leading to phishing or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=tense+chart+with+rules+and+examples+pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m0sgjau4gb9fclde388poebie4/vujerulibunorapudipox.pdf
    • http://memphiscentral1969.com/clients/865565/File/76554029038.pdf
    • http://cmtdental.com/upload/ckimg/files/71943800291.pdf
    • http://www.chatanakonci.cz/userfiles/file/26018783732.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/djitav8j4krg5o3pvdcnhvkltp/81282562874.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1e48ce9a---poxeremetufoposo.pdf
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/biletenukitivekewupad.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802eb7e3944---kosukorefedik.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/wemukeze.pdf
    • http://samuiluxurytravel.com/Uploads/file/93296426087.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffcfe2ec64---tefowevoju.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/66ps4c7e0fqc7kpd23shtkru6p/35057287934.pdf
    • http://mysistermyfriendministries.org/clients/85776/File/talopawuxekumadadasogub.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/18f6148cd790d17922485fbc3624e4e0/zapefutazobitosima.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609628476e12f---13785985843.pdf
    • http://ozkayalartrans.com/userfiles/file/xiluterajig.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/59l7mvdue40fva690hutrtb0e5/16445637598.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/e272337662ace73f254fbaeb1451e664/gatorumelofaferoze.pdf
    • http://jedzenie365.pl/ckfinder/userfiles/files/fojuwubisubepuxeri.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/627fc0ae860ebbf06418030db1c05311/69661466022.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a745be6ced9---43924256175.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a43317709---22902422006.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ae1ae62d628c72b0a0805419107a4f55/94282623800.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e23d.bin
c5947f88b83859b68822d86e2df80d60fbe50e701466799843353dfeb48b4b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 16628 bytes
font_01_sfnt_off00010dc8.bin
815f1c06ce677c2c55c816e42089354f4b9080c07a5af1414251e276aa1a4637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 11016 bytes
font_02_sfnt_off00012741.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 16792 bytes

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