Malicious PDF — malware analysis report

Static analysis result for SHA-256 161e2744194e09ab…

MALICIOUS

PDF

89.8 KB Created: 2021-09-06 04:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c1dae721c664468f7e8b2e64868718f SHA-1: 5feb6524f8941ca43becf865f01c9cb4e8e03837 SHA-256: 161e2744194e09ab5241efb533c0c2bac75001ae3c8700fcef993c6378c7ea4a
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, forming a link farm. The primary purpose appears to be redirecting users through these links, likely to phishing pages or to download further 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 http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/80423000006.pdf In PDF document text
    • http://caphegiabao.com/upload/fck/file/pulonasak.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/wowoji.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/60466675268.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/suv0gg36f4lipau6vv3krgs27b/kevidade.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/87972701660.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021082111262814.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/bizotelopuvak.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/bolojibivegilafizijopu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdde6e8ea9---27471093991.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/rutekawujidipazip.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/vbf67r7due71gl5uu1jhsso4sp/vujidupajajitajobobe.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/dazipujulalagunogu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d93334dc8---buvorizabobikerikivulo.pdfIn PDF document text
    • http://hasyo.net/files/file/59994465612.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/vexokaninimek.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/886be17cb976acd2793efe5073618833/gidekenolewe.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/wugudapifoga.pdfIn PDF document text
    • https://soechi.com/userfiles/file/46402374262.pdfIn PDF document text
    • http://impactmediaresources.com/userfiles/file/nuwogilenijukomaw.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/87hgnft5v0vg808ggkdfbem9f0/86957388596.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/jeneji.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/72333389683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=el+atlas+del+cuerpo+humano+pdfPDF 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_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 10876 bytes
SHA-256: 1c94b695546d3bb9581a5785e81a65a944141b30e8317d27d1d33baef6fd1b40
font_02_sfnt_off0001238a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 20976 bytes
SHA-256: a7977665e42d70f123f3f304d99882a06fffdc87e2cc71b9225e35516155c509

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