Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e8a50889c1e492…

MALICIOUS

PDF

78.4 KB Created: 2021-08-27 18:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d35574640e44e954571a56084e45350f SHA-1: 1af1b3d70ca9bccce514acdd3b9916707152b765 SHA-256: d6e8a50889c1e492d06af56a32fb78b538434acc324161f43922cebf36a9abe9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of many URLs indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=equivalence+partitioning+example+pdf PDF link annotation
    • http://bbfederico2.net/userfiles/file/dadunaposamabomedapufu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/eccfb4280c1a3cc0c200aa39440d6546/relupetofatupitogo.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082816705b18---zefesox.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c3ec5ad4f3044afe53e1517fb5f65d3d/kolimifolipabefufavak.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b386d1984---topanijexiked.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ef1c4f72c726a821a8e5a6baadb708fe/kaven.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dceccc8d5b---fimafara.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/48e1d0f31961f2a01b07ad0c73a65d44/guwunikubotufonirejoko.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/lafozimifidetiwoxen.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/38721261376.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/watibutojosim.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/zajetuvol.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/xiraruzive.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb62d469d0---46647481990.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/87abdd1af4906f7e8bc3aedfc8f0ff71/tifilipivevawitiv.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b4faa911d10d10014def2a7987338b20/podunal.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1cf5e43d9---81252491056.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/lukesulekodapobibovisug.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fec4c6e91---90197086889.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91fcbb0a5b---refevanimupaniz.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16092f16f742e4---jinuxokikalogojawogofa.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/93958097216.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/mutalo.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/dejixoga.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3A 17300 bytes
SHA-256: cac52e64a0e24f4cf6d1b3d6a7bfd59a1b604592b7206e1fb68d807a1ce196ab
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 11192 bytes
SHA-256: 4ed4a20721edc216fbc58ed72d3d3d18b3198f13f580eae17912cb1de00b6f80
font_02_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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