Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c5715f05c12c97…

MALICIOUS

PDF

88.7 KB Created: 2021-08-12 12:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3090fd17c66aa5ff23d6b10efa409910 SHA-1: 131f75655f855d36b08b1af7d80009b7f3d4dc50 SHA-256: a8c5715f05c12c97a0b918cc61fe2c941eec4152b3ab8cd7a6d4c3da31f71b32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect the user to a malicious site via the link farm or the embedded script.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=the+beginning+of+civilization+crossword+puzzle+answer+key+world+history+shorts+1
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16082250c2f38b---panewemolagiditulelemite.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/uvr7t9si32tlp2itksp1q5tmg2/fuwesiruzejerovunukewop.pdf
    • https://northcoteplaza.com/userfiles/file/80899382165.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5341d7cf47---94613617880.pdf
    • http://musiclivemarsala.com/userfiles/files/81497402314.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f9673f0e138c27bef7819745c2e61e42/pemusosupekakilifuvenig.pdf
    • https://alajuusa.eemedia/contents/file/dafebuvakinanalisakavil.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e672e58075---mifipedonofuno.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b3a5ded2---70995303744.pdf
    • https://movie2book.com/userfiles/file/86053267707.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/agdgo5q95s083m7hb7dtgbht6j/mezawojavufazexojumukomud.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/p7k8c1fuurpru09tm3ih69gmm7/32834047134.pdf
    • http://zabradli-znerezu.cz/userfiles/file/bipunikufitumot.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/daa7e4435b5471ba91767b140a4736b4/nopapadorekezusaxonazib.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076514de3b66---totawope.pdf
    • http://qunjl.com/userfiles/files/98320461711.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/fadasulozimazelogijokeb.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/68d4545ea6e567b8937c8a7abd2add38/39972649344.pdf
    • http://all-vehicle.net/js/upload/files/bisatova.pdf
    • http://pk.mo/userfiles/file/fupopiden.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/731a7f3a39334c77869aceb8708319f2/zexuses.pdf
    • http://tecnoservizi.com/userfiles/files/85696654278.pdf
    • 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_off0000f3d0.bin
3d861fb47bfa916961f3d1c7e9e5e31cca268199b3187c99c2c7964319df07b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 11572 bytes
font_01_sfnt_off00010f09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F09 16792 bytes
font_02_sfnt_off0001271b.bin
b8a9309ac3cc635576191bc2e8531659f172f408ea53ec1bf1881bbae072d600
pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 17432 bytes