Malicious PDF — malware analysis report

Static analysis result for SHA-256 266eb8cbff2a3f98…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 11:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c5f63f4eca03c104f57d67f1a637cea SHA-1: 3cccc83a2c18e417b5d5098d6ba1846fa7fc6f4a SHA-256: 266eb8cbff2a3f9896834e95560bee969f5d9d9a41a1e699e2cfad415d8ed0d1
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many of which point to compromised websites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable domains suggests an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://grandp.ru/userfiles/file/vagunefi.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/36312415656.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5ba37022d---kurinomerulatupekelegiz.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c2946f97f---67987374604.pdf
    • http://jfhcoaching.nl/userfiles/files/60936537929.pdf
    • http://dinobajka.pl/Upload/file/gisinagal.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dc04d9267---ripizokuwotuxedemok.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/33onhivhrlt70n2n5ao1s92tp8/mamawogugolafox.pdf
    • https://thefertilizerequipment.com/d/files/vevakibobug.pdf
    • http://adbrf.com/files/fckeditor/file/182651320612b2e125aa09.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/9493b1a37e23fbeaec59015a13a32375/83440110060.pdf
    • http://bike-aholic.com/UserFiles/file/3569282621.pdf
    • https://juraganmonyet.com/contents/files/92776282827.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/45252284592.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/vofer.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084f8ddb6855---wojokerotexab.pdf
    • https://cowichanmusicfestival.com/userfiles/file/33473168636.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094662616cf7---vimodelimes.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/gajujafubir.pdf
    • http://nppmaudaha.in/ckfinder/userfiles/files/bixibezo.pdf
    • https://terminal.hr/userfiles/file/53801703327.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117753171a01---xipudofogeti.pdf
    • https://pearproperties.in/userfiles/file/11389552373.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9f5cf2f6b37e7b169021ee0e93e2ccee/sonalisufa.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/ralemudo.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/95816d5ffe42aa08bbab1800a0ee6cf5/51040702734.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mini+wood+lathe+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_off0000e391.bin
0bbdb6d45faaab04e961efd932e020278c8e3a2459de6d3dfb0b9d00351b8f98
pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 16612 bytes
font_01_sfnt_off00010e94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E94 16792 bytes
font_02_sfnt_off000126ab.bin
c98bd6ef275b6f55d0eac743e5e719bd70111219f3f610ff038fb22393dfe149
pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 10404 bytes