Malicious PDF — malware analysis report

Static analysis result for SHA-256 550b71816f233812…

MALICIOUS

PDF

90.7 KB Created: 2021-06-29 09:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e91046d6a93153b50ff72c4e73b2290 SHA-1: a864e983aab825db300fba1a218ec6e5071fe65b SHA-256: 550b71816f233812530098f7c901840cecc741b2ae1bbdef341ee5956b98e596
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845f50230e5---93830462159.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ab763bc322dcf3415e3dacfd0b00ebea/7495696039.pdf
    • http://innotec-industrie.be/userfiles/file/50904009080.pdf
    • http://bukharageorgia.com/sites/default/files/file/66010878874.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d8aa0f6421664d3de3620fa791f50e3e/56264067980.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/deb4926015c75036f06551e99526bee1/bukekotopobone.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2cfb2be293fc15c3df4d67a219f6dbf5/xorojaranedebit.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609054b3137c1---30473856725.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/3qp5dtahaj30nd5tjt5bg3a8mr/powebimasolirinekepud.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8b547c2cfc84ac0187a51adf16a79378/18135721701.pdf
    • http://banghaija.com/userfiles/file/44563997463.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/20d14c97c30fb6d8d3e7e033b9fba40a/15356293639.pdf
    • http://vimbark.sk/editor_uploads/files/96349514483.pdf
    • http://huh.hu/UserFiles/File/59153865286.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbe27be23---92076829350.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/34275524263.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0eb15c0ddde547ab02494a219c53751/65813757871.pdf
    • http://bc-arman.kz/ckfinder/userfiles/files/fugix.pdf
    • http://bannermaul.com/userData/board/file/14922660775.pdf
    • https://bandai-k.com/userfiles/file/vumelalekir.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/66cf75b32c456eb4746dad51149c8567/63970485558.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gj5kahu4m9mkg8qhjulqofcff6/22387227545.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ddd30196e---gerudusiwepumulixovovet.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2k30mg2gtk3gpa3kcac9i29n0c/55177383171.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3m4h071rgkts32fshl9tj18od1/98817872726.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+add+pdf+to+email+body
    • 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_off0000ff1e.bin
456b7c9687c072d5952f62485f2757e6c2a2b62dfc8bed4f7278bde23ae7f9ce
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 17688 bytes
font_01_sfnt_off00012d4c.bin
3c04c82adf7ce6ef48cffa82108bd7f757ed23b408d799b149377fda28e73d75
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4C 10620 bytes
font_02_sfnt_off00014565.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14565 16792 bytes