Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d686fefdbff65a1…

MALICIOUS

PDF

86.6 KB Created: 2021-06-28 07:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ef242c8fb950e4ba9b513f1b2e2881f6 SHA-1: c647a76f48ad6c0c347b4f0846b6dd1ac2d3432e SHA-256: 8d686fefdbff65a1dbb1c9415af467c558c91fb9f0f2235d05b5400cd6b4259a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://catamma.ru/uplcv?utm_term=find+the+smallest+whole+number+that+is+divisible+by+10+and+12 PDF link annotation
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/859bd710f38ff5fe8b39e6f70ea3c086/fujifodifunipakizif.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/74038914820.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/91ac2e18a4bfc5260ffe42fa09e96ee1/60331845905.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a404f36f---90801497203.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/28529b16be4fcf223424fbf969606abe/ridelelofura.pdfIn PDF document text
    • http://dzbnf.com/upload/file///55332741097.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/51232636920.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/34863241890.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/wumaxapekasona.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/geximiv.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/43111f706b0b8eaf5653c7c4de0b072b/ruzolekaxiv.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/fb4c49d2a18159f4f6c7b2ff17a9c725/kerurolojexovumasojav.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210528005809_1goh7g.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/gujonedegu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac025898dd8---10740926976.pdfIn PDF document text
    • https://anakmeong.com/contents//files/nikugopefukeve.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/14823586118.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/56243534616.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16073778f4ae72---zokuzo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e193ac71ea11581e2dc94f9d5b51474a/robexerikidepovijoru.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/vidopugedebaz.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/76760421751.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/87785791107.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092d6aac10ff---83238895952.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/mitepejuwedurixumefope.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/visajevojal.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D6 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_01_sfnt_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 11288 bytes
SHA-256: 4b7a9d13360d249326c9ca3839e70117778490406654ce26cb614781a4ff682b
font_03_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 16508 bytes
SHA-256: c13e70dc6d43c843089c6b183d1ccea00b6bc311de7e14726ecd15fa26e12128

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