Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca9421297caba6a…

MALICIOUS

PDF

87.6 KB Created: 2021-06-28 20:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ae60c0be81aafaf659f64246863b74c SHA-1: 43c249f857f076f39fa45bd9d47acea5178923cd SHA-256: 6ca9421297caba6a7917bb6872d8bbb33e6d87b859fe47ab8ec21fbdc7f2d39b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading a malicious payload. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly indicates malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/07od79kjbos5v6mbhhdc0pvnac/zixubagatuvamidedotopoj.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/1hqqrbsgude5i7j1bmd201rvu4/39213366189.pdf
    • https://hirurgija.me//files/gabatujimevazisisigase.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160770f2166217---fupegomenenejawuruzuwovo.pdf
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/59366149370.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tedv1pcbvsmuat26jv2btqmm4c/97300088295.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a00239e5d89---suwodorile.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/oiai14fs34odhl8f7o0et6uflg/romogutajo.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/d7a83b1131476aba917e7bfd997bb6d8/80984309681.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072021003553---rorovopurijobelimenobubol.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/llts9q117cpas7q5fu3mqtbuc8/fefegavezizupijo.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/d6lco4i7frfqp0u1jqbtr7ugs9/18262849557.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/lufukusowobutewimawudixez.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c785053141---pufow.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/f7ec3c83b7b709e9a3f95d48cbd84fa0/5891080374.pdf
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/7esms9shgo47g7iq298ifmilkf/43118988187.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4107d2659b---toredevurozonaporuj.pdf
    • http://bud-drog.pl/userfiles/file/wadaxopesifakib.pdf
    • http://guojingmall.com/userfiles/file///32205284496.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/4fa8e4b270d78661abee40383efd083b/xobewoxusupawiwigozejula.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a547e60adbb---mafozexavisijumudaz.pdf
    • https://paron-rebondir.com/uploads/files/22447283528.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160d73d07ca4a1---vasorebutirilakodatomitaf.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf78891c6---bepewudisik.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=among+us+android+hack+download
    • 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_off0000f2c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 16792 bytes
font_01_sfnt_off00010ad2.bin
9eef737d4edec969adf39bf951019176ef2186dc7ff418a52260056e853068e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 17420 bytes
font_02_sfnt_off0001389a.bin
625a78b937d41670c728197743543bb7c83a57acd797d330c707c23a687da2e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1389A 10848 bytes