Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd508292a4838dc…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 09:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 089c45caba558bf10e6865388b626a6a SHA-1: a3bc85feb0f2bcd45de8249ccf6a877f64b25966 SHA-256: ebd508292a4838dc460a688c63d883759b412c81b6fe8875658a4519eb94fd00
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which appear to be compromised CMS upload directories. This suggests the document is designed as a link farm, likely for SEO manipulation or to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/453ff5355dde14ac7bcbd10c6a74cbaf/27279742207.pdf
    • http://hi-techfiber.com/userfiles/file/26482226326.pdf
    • http://chikatere.com/Upload/files/60117446388.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef10bb1e3---bebomojozola.pdf
    • http://chromowane.com/userfiles/file/jodokuderadabuvag.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/gd1rt65n4bf7g6ar4nvfu0dgoh/69141465771.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/mcuu8ue4hdrpb2pfsvedqmmc2u/21703130641.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ade9d8d77d---30318215619.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72a4dea9b---54953429614.pdf
    • http://geredekombiservisi.com/userfiles/file/pebinuwutibozavitonokosuk.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/541da9def810c0fb6172649659c05cbe/ranurexuxaxuz.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1b2f277e6---20955343614.pdf
    • http://kapsalonvogue.nl/files/file/soxididojerowosujimon.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc593e9c36---96385995777.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f896ac8db---90891825264.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f44737065ab8975122b0d166589324e8/somupujilekozedakob.pdf
    • https://alexandrapanayotou.com/web/images/static/file/15534879059.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/16666502018.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52e56096a---53283900875.pdf
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cff0f145ad---66844596419.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ddiiipolh2e2a3blcbgiquvkv4/tirofasewi.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/nugasegifuronexorawenuw.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5bj5agln751evrifn2mcdr6jv2/zujuzower.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/593848e6b486419bf2bd54969b73cfa1/69901047175.pdf
    • http://csc-021.com/userfiles/file/20210626044927_fiuciz.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/44e7525336c8bd8993ab66b627e98639/motoraf.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/847598008831fd6a5e9703d2e5a549ed/mupop.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+propyl+alcohol
    • 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_off0000ec6c.bin
6f1e80ba0c963dd13db4951c4421ac961f9a3463a4b21a662c079a5bc40f3460
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 10344 bytes
font_01_sfnt_off000103f5.bin
8ec2893d4201878b0c4599ddcb1fce21e96528652d8032f42612b98d41cb4beb
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 16624 bytes
font_02_sfnt_off00012efb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 16792 bytes