Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98504749d622dc7…

MALICIOUS

PDF

86.1 KB Created: 2021-09-08 01:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1676dfe1285eacf34d15dfb254c5e463 SHA-1: f122dcddf3dd6e0ea2d25837e095f0b9dc41d132 SHA-256: b98504749d622dc785bf85315e64857c112d3e8f76c4e0d213d43c34e6a15a96
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These links are structured as a link farm, likely intended to lure users into clicking through to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary goal appearing to be directing users to potentially harmful external resources.

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 https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0f0b1728---tozazewapuw.pdf In PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/48749914306.pdfIn PDF document text
    • http://midospa.com/upload/files/gibabareganazufupatomesu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f243290c0---bixosafel.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/24299978383.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608909b41edd8---gejopudimawuxexenesuw.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/77477353348.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eab359135a---mamifaxivena.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/edbsib87mbmtqm5eiiqntqnqq5/91933891562.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/43040576164.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/tomefesesaliwabuvoxip.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f9573d71af5687283ffc2ee517ec01a7/musubupararezaf.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/saxeb.pdfIn PDF document text
    • https://trips-in.com/ckupload/files/92493418402.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/03e23514goc616e6qivqpkqi15/35826153982.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/90e8639e251fa224f2f6e854d50b6c70/doboduf.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/41063d3883157fa6fa1dd89086a5b212/gaduxogepe.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126d258f2b7e---78292638866.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/1223678410.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/27216124462.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/memaburokafujedu.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///42283110281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=english+language+proficiency+in+the+philippines+pdfPDF 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_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 18400 bytes
SHA-256: 48162817364ce82fcbe08aef6938003069c155a85581d03d5d893dc9f16ec74a
font_01_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 11096 bytes
SHA-256: 3ac95d5389c071914c7ffa23be279cf3dd73e90dae6185e9fed3495e730d7c4e
font_02_sfnt_off00013245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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