Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e5beee516d5388…

MALICIOUS

PDF

90.1 KB Created: 2021-07-03 06:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f982a20f1f520c0734cdc6c48dca33cb SHA-1: 06f4324277dc7ca88957ec2317379d18a641f7fa SHA-256: 31e5beee516d53883145ab96a082141c7ba23fc6cd99daa7d5912a11b8245f40
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirecting users to malicious content. The presence of numerous links on compromised or disposable domains suggests an attempt to obscure the ultimate destination or to leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://grandhotelbulgaria.com/userfiles/file/pafopojesokeze.pdf
    • https://creteservices.com/FCKeditor/userimages/file/9281057427.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nufaf.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed81303f7a---mimosupujesazo.pdf
    • http://astro2sphere.com/admin/images/file/suxodenarezepudeguwo.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160792a570eaa1---reborilubizar.pdf
    • http://tivatijapan.com/uploads/userfiles/file/46920755721.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160946cff441e3---nemomuvutepuxoronibu.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b3015c30782371618dba5a7a6d636e1b/dijusopitumor.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3b9460b21d4876572f40f89dd705ea56/gifivajujumogazusop.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/97iop1ncotm0lo6a1mv4ojgui6/peretitemituremufule.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a83d343a19170b5c0e4fa3e1cf2af759/26575530054.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cd71b160c---vuxuporotikerevakugaxedog.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071db07b770d---87926215468.pdf
    • http://stellamaris.cz/userfiles/rakujadifedefami.pdf
    • http://polipack.ru/content/file/9264317436.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f502a9a2d0---87763265311.pdf
    • http://sun-eko.eu/files/file/jobozewidibulixewumumot.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/murofajovufisefadupo.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37a86c83e---givepazi.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3c1ac826875819281dd6e3357ead5cd3/41439929119.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/28shpvfk54eq6q66q9sv3875n0/judetelegebubezibelifiva.pdf
    • http://crocepadrekolbe.it/userfiles/files/59189558049.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=monroe%27s+motivated+sequence+example
    • 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_off0000fa67.bin
a1d8f029f799912987f3739541c981b2af1762b5c51cd47df034cd06046dec6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 17288 bytes
font_01_sfnt_off00012758.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 16792 bytes
font_02_sfnt_off00013f6f.bin
d286f4b2ecfc431f3ac042e107f825008f6919c3b87e2df95676e29868bc50b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6F 11116 bytes