Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3326ea37e2483b0…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 17:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c611c3cb41bd6aa86952d24be1c8138 SHA-1: e618240094b49ce58adcfef62239ae8c1dd2e8d6 SHA-256: b3326ea37e2483b0a148b43937dffbec86793b32bfc027de60d5eab99bb82e34
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm pointing to compromised WordPress upload storage, likely serving as a lure for phishing or malware downloads. The presence of a 'Password-protected archive handoff' heuristic indicates the document may be instructing the user to decrypt a payload, further supporting a malicious download or phishing scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=pmay+online+form+pdf+download PDF link annotation
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79f2b30e3---24880220143.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161306d92de849---vagirawajubusike.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/747d6cf13de50c2a03ed0ead2142699c/wokepop.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/10fbbbe25184bdab67153e59a4750f30/9497903837.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/nokazatafegova.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/28230296533.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bd2tg2qft9o1gbj3tfs6r2quk1/tadebusejabevudebajusezam.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/turagugagoxowozoxewo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec07f107c5---xizir.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/i3tavbvo5dhd962o895ddlsk44/gopadanep.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/u7h26uuj66ckejbek9bnbjptvp/70391867292.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6fb75c60---jemavinofoxovudiv.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c22f05fe9363f8b4c721cbeb767fd49f/mimesunagekodaripo.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/vekikalokagamofapate.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/bb14fc7a3cee5845f914e9e6ac1f0d91/84531221269.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8ea0daff---karosoxuxin.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/matosovedirijajajajuwo.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/2391033870.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/kewusotatudokitefu.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/22552607331.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/4856d09958f9ddd3a6e971b24227f882/91154901635.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/39485473025.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/89895173163.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/93332795150.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_off0000e2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A7 10596 bytes
SHA-256: e7346d1fa958536409b670beb02005978c762934bb5937d9e77a2c557c4a6e05
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 17752 bytes
SHA-256: afec4839036b08b345bbad0f99d68045404e8a9653c73b3e93f055b3be4b8255
font_02_sfnt_off000128f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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