Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a9992f24d3c201…

MALICIOUS

PDF

92.1 KB Created: 2021-07-05 00:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aaa9ec699a7ab6d26be9f12c6a3a4203 SHA-1: 67088265b3659e4ccc18d52944fc09836303139f SHA-256: d5a9992f24d3c201539ca97b0b14a50ba67a399fb51c9531c7415ab124b4815d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm for SEO manipulation or to host malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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=speed+control+of+dc+motor+using+chopper PDF link annotation
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/o6p64f53ckgf1s8n2k92drcsug/xujurera.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/34669378722.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a599bcd0ed0---dosigofasamu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/pjba2bgfum7m2lqndcq1lqcsqr/sisutabugelu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/97eaeb6cbe4188f3161fed0f0811ffe2/9860607927.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/5857266637.pdfIn PDF document text
    • https://ubranni.com/uploader/files/vututurunokukakexiravaz.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6acf4f83534ce0b49a7f02eebf89c73b/vusez.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/43b8dbf560955fc40748a9d4a0117862/29461382329.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d8966858742296df3e946903c8fa4e41/25148828119.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cb83be28eaf---19103176742.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d460d65372---gojevifuseresuba.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/164b5524a9ba3d0e9c39874903ba4ba1/konesivagusewavapapebiw.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/21360810985.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd918284ba---19662061904.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/sibugevovasopafizit.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc36e5ca8c---718227699.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c8e16f065---vuwekisu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ab2659af22fbf141f4760821a2ca4d3a/18263456737.pdfIn PDF document text
    • http://brlairport.com/images/file/96240214913.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/74834083357.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a2fe67f694f7a47ac01e2af74f10294e/zanoviruwepaxawed.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1c8ecc479183ec90a884b20dda412277/12569046123.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ceba4de3e---gotukorigisiwazimura.pdfIn PDF document text
    • http://indecomavo.pl/inc/kesugo.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1db23a5bbccff76a5117a757c8244008/tebefixagexomozulujobo.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_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 17612 bytes
SHA-256: b1b6e1a02b4e9dd6dfce4235035540809bcfeb29033c6b319155b20ce404653d
font_01_sfnt_off0001313a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14951 11080 bytes
SHA-256: 4fb748baf27f8b02c206b8c449b82cb2237b4f5ef35c8efe2977641a1df69755

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