Malicious PDF — malware analysis report

Static analysis result for SHA-256 d343e6cac0fff3d8…

MALICIOUS

PDF

89.0 KB Created: 2021-06-27 16:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1936eeffb806ce008420346dfcccbe99 SHA-1: 9d2e891cbc522a2866c024916630fc4682d94694 SHA-256: d343e6cac0fff3d8ca0825a1034b5b53d552c48c5b10b811bd8643a23273c933
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2edfktp04j6kss8r60ml5rauro/kenonanin.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/99359052663.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1685353a62c977a69e58d1e978b8d233/93473032306.pdf
    • http://sillajen.com/fckeditor/_upload/file/2023287566.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160733b352ae7c---7020652306.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e8714e038fd66622343ca0a4f45636ea/fogoga.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/76378488a4d18752c346ce9cca3ca412/94358357875.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/xuwijefotoluduvabomeduzuj.pdf
    • https://5a.ro/ckfinder/userfiles/files/rasapasadonosupizal.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0082319796---55292418786.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/115f71180ec9919b48bfb99d0b568e58/xirexixafusadapikila.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bcef862b728---tarifatupos.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/505da5b9bdf04df9bc0ec032618ea52e/pokinipif.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/rizinekonux.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087596a508c0---fejofipatijiba.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/68c8d056af0ee133820bd4006862baf7/24529704856.pdf
    • http://phrabat.net/UserFiles/File/81093129016.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098879d434cb---liborebuvowalilovi.pdf
    • http://thoitrangvabaoho.com/Images_upload/files/63345487297.pdf
    • http://toshiba-center.ru/uploads/files/24129820304.pdf
    • http://clear-es.net/yamituki-n/uploads/files/43374415245.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/51c293bee38408702c137933a483851e/zonexi.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45b66cf3a---68474611305.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/b4la9c8q97i336qf1cdbndsec2/71568237160.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839431a41a4---nalizodabuwubiburepa.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9531b4ea3---xomudu.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/6cdbdbff89782975a9b82455f3803de0/89906840932.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9d74893b6b93015b9dc0ff00c607726c/dibodoxukowenavemejotug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+unexamined+life+is+not+worth+living+plato
    • 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_off0000f71c.bin
b8ea915c4e2d61cbf3c49a1745d0fc7a4675c7379ed87a156c9b30a21de513bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 16712 bytes
font_01_sfnt_off00012250.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 16792 bytes
font_02_sfnt_off00013a67.bin
c7129e427bb199d204094453fc0e1a5848dca6893a890e371b55f621623a9d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A67 11264 bytes

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