Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc74df7d03eaf32f…

MALICIOUS

PDF

81.4 KB Created: 2021-08-26 09:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ffeab1e76b3a32d71b1f8f90f16f633 SHA-1: 24bae381d780b5dc808f5f0f8dea7888d650255f SHA-256: dc74df7d03eaf32f6b70d40bd6f1e66b7214d9cf3e516e948e723cffedc1dc72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous external URIs and link farms pointing to various domains, suggesting an attempt to redirect users to potentially harmful content. The presence of compromised CMS upload links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://synerhu.ru/uplcv?utm_term=liver+colored+german+shepherd PDF link annotation
    • http://dataction.org/demo/dataction/media/52031397906.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/48148277984.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/67860158410.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/62969136551.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5ac6khtg8phi0rr5jjn3n8tct7/darufimuzijakaroti.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc513d6ec---tudunawefaralivej.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7af06da2c---zidoxozipuzinugov.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/19712145243.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/xupodojitojobulatedosev.pdfIn PDF document text
    • http://tid.vn/upload/files/fitanoxisoxirosixumo.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/s4labrt6efeae42hho16iiki8l/92663022773.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/3188234337.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/u8o1nc8n1gi3bqdhpogis63hkt/vizujokitu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/28094429587.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ud6cvo04krggcpptl4mopran40/tivajofulivek.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/tujafadufimizega.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/kotupixojeziwidaturikefa.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/33944927236.pdfIn PDF document text
    • https://greenways.at/userfiles/file/tutexewemu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c5655a1a2ee1744814c8b13691f8cac3/93002209961.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e03ccf9b0f884c4b4430f306b6afb4b/gotewixesorogewulu.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_off0000db87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB87 16668 bytes
SHA-256: 869e1018eec962f9b196386c32fdceca5a9a2485a79e3cada40f986ad4802c2a
font_01_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 10888 bytes
SHA-256: 9ae2fd1fac92522fe12f087e82fe57175aae2659d446b79ffe31927cff2b4771
font_02_sfnt_off00011fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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