Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2f3c211f331c68…

MALICIOUS

PDF

81.4 KB Created: 2021-08-20 01:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fcda161395e7a8c53ab0160b68fea506 SHA-1: bd59811aa5ab93db99e74fa49e2fdbbab3340b9c SHA-256: 5d2f3c211f331c687577ad0d13d3e90f4f0cc24630bd60d43e54fd399ca9cd31
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary function appears to be distributing traffic to various external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://w-mill.jp/images/file/6336380569.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0367d1eb9ff6a66e24de3ee3bc63942f/vuwubuj.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/30351464051.pdfIn PDF document text
    • http://renovator.cz/files/file/62065028913.pdfIn PDF document text
    • http://mamsongdamchoi.com/images/chua-phan-loai/files/zazis.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/satajedulil.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/67033654799.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/63877204606.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ab4b8dcbf0b0bf46491c5a0d3a94b407/vafinebudejizasujum.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d7347ee75---pomejudek.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b1d0465047b0c790b696e890351ce9cc/81842322263.pdfIn PDF document text
    • http://benetalent.com/upload/files/95202323212.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/43cb33ea1b599eff3358f3a99e7405a1/19300694878.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/xadosovugapaweru.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f4e10a7c8---dagesudegaferepanudojo.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/92259540312.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/gapir.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/ditutigapebu.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/72577938756.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/kiwasatokogoneforevemipij.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/jalewupotixufi.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/cddc2d10ca1bcfdeb58a7598e02d6b04/karoxumukusemeweze.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/9038302790.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/ledefijogemepusuxeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+simple+friendship+bracelets+for+beginnersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF144 11376 bytes
SHA-256: 0637daa3837edbe17cac74cb3fa28f8abb87050e5316c3f90c430b1142c8881f
font_02_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 16984 bytes
SHA-256: 9dafced071f4e6860d6c3a41d6ba8441f4203c497a206dde8605e644cbbd80e8