Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ff2314d98991a4…

MALICIOUS

PDF

105.6 KB Created: 2021-06-25 23:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab2f80190da91a5c2b596686eeb06232 SHA-1: 7b4f5c622dd821ab969a843751ef926c2ce7f07b SHA-256: c3ff2314d98991a43377cf98622a944ddea087ba57c814ec07d637bce70695d1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, specifically targeting file upload directories within the 'formcraft' and 'super-forms' plugins. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to further malware. The presence of numerous links on disposable or compromised hosting reinforces the nature of this document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16085df5d7e31d---1186254471.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b769504d264a44e496787453f3ce051c/2554749704.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c1c7f647---6821436189.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/vesenikilumemu.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/jsivjgq6bksfgunjh903v4es46/62419651092.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97dc88d6c---nesijeribabex.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/21856470898.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/12175679092.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b891060ae---29786049516.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc425f2cd---nakalu.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210616_FEE8C956DDC38C84.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/75521814686.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/57593670518.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/wixapuvavemabajub.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///48461497518.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ii4tde11fd1hq581c26dlq7fu8/92805235307.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210609004510.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf56c9dcf7---ziwixawebewukosadesukuvip.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/83700639f7d1a252ecde1314ac4bed54/besujekeviloxig.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/c51d5ofl1qtd37hlljp3oh01pm/40980511948.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cgo9kdec5bdmabjci2vul7rfl5/xabowat.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7df672f5ea1da8e847308c67af259840/54313893563.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a38e3ea8066---xegekutamowa.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5079a36f0---wufajirifiloruwinuk.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/55744275050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=collaboratively+in+a+sentencePDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001024a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 16792 bytes
font_01_sfnt_off00011a57.bin
06d5124e383c73acdfb6e55783614b6c0f2c4216d0a9758c46d7951b2417ed2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A57 2664 bytes
font_02_sfnt_off00012598.bin
af48bdf4f67c933878715692f8e860c55111b22b852598b61cadf24238637ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 21988 bytes
font_03_sfnt_off00015dd1.bin
85db881aa2b1e11d55a92e28e788eff69a8bcad37dbfd811f25f3e5f2928986d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD1 10576 bytes
font_04_sfnt_off00017627.bin
603eb056cae573b6888ec6828e61dffa381f56af336103f63cd253462d87b42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17627 19540 bytes

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