Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc83999957712229…

MALICIOUS

PDF

85.1 KB Created: 2021-07-01 12:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ca6213fa29825600122fcd6cbc8c334 SHA-1: 75e8cd3c0543e2dff139ed02456daa068a916b71 SHA-256: dc839999577122293399ce3aa699924e34fc555bbb3fb19466002aff9fcd6625
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/136772f95f5c2eec2b0adee3aee47f12/joxovi.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0446emeumsgktt2ipr7vao2pr0/57464545609.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3e860ac48---44663230159.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/rfst8qtfngv21fln80k1gj827d/2420305744.pdf
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/4802673537.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b10a97927b9---19868141983.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfc369777---vawagokejigenilolumego.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/af259ad09caf371c30e6e80ace5bed93/pesezixegozazil.pdf
    • http://oreade-breche.fr/userfiles/file/datovexaxigogakifudixek.pdf
    • http://vodnik48.ru/content/file/22398906383.pdf
    • https://hsse.cl/files/sofagofawelo.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c740e34d37---bewijuzegirufin.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db82ed91fd---40942465524.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/1hhpc1rho37128rdi14oigl586/sugifigukoxolopisezolo.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928beed4ecc---70299253585.pdf
    • http://hainescentreasia.com/images/file/jufifaravekun.pdf
    • http://efuturesthai.com/uploads/file/voviluvopogamebubod.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d0716dc4---xobuvatu.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16085947e15d6a---sudomaxabudamexolisazol.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814c168d22---xefilawitowigatekalupazi.pdf
    • http://huntland.hu/upload/file/28346389502.pdf
    • http://www.rify.us/cms-uploads/files/32266244927.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/hd06nko9dsvhsp69543iaf83f1/fovunakavo.pdf
    • http://konemara.hu/userfiles/file/dilujukuruwuputulugazove.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ktet+category+3+model+questions+and+answers
    • 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_off0000e883.bin
2faa861a45b463a335e6ca2a0e927206d857974f01d0c0e939a8c3853ae665c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 11320 bytes
font_01_sfnt_off000102ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 16792 bytes
font_02_sfnt_off00011acc.bin
5190e62cadc747387176869b1ad6acfe7256516fea4ec2c4a7de872550c53d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 16952 bytes

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