Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c9b93d54a1fce2…

MALICIOUS

PDF

113.1 KB Created: 2021-07-03 08:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be8daacfc68408753341263950efc2be SHA-1: 519b8f2a6073638f5ff9fae3b2ed108d19419a68 SHA-256: f1c9b93d54a1fce294b468cdb57b9b078fb25d08da3a683f6bf815eda9f7af82
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of compromised CMS upload storage further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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=what+is+the+meaning+of+the+proverb+as+you+sow+so+shall+you+reap PDF link annotation
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e1057788---90774648998.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608422a3666e8---26920438904.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/joxugovakubabudujizotajat.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c34da09db00---39864005701.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/8fe6b0284fca1ef30a3079090ada60f7/22397237297.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c644e78dd1---9700070084.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c98530b54f---66378644817.pdfIn PDF document text
    • https://brs.jo/userfiles/files/liwejokupomosepi.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/notexetam.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce237e4d691---25634913033.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/91476338685.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b42049be0b18c30f02cddf48650a2498/53752092358.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/wasodubasotukaruvenegite.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/adf7ab0e79b5635a15f56cd66d3c71fc/76508329331.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ds17p9htkpv0im02v4r4ciu4s6/983238850.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/621b86ab7d3c2d5d9d226b22249350c5/jonedakaxorebirugiko.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/75a2eabc14c888bca338007f67f5df2d/lonevuradesi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813db6e2383---busumifewona.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/766h4hd737r58nv4n80q329t13/gobelivewowemi.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/dabakugumivifezew.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/ropotemo.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016d98.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16D98 22060 bytes
SHA-256: 2724310cabc782b032658c0417fa49b8df288da3b0aa73692f6aeeab2f393bd0
font_00_sfnt_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 35132 bytes
SHA-256: dd1f10f8386bb17c292fefacfa7e5d16af108eeccfcd121a4fe03e01e76fa20c
font_01_sfnt_off00013b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B48 11304 bytes
SHA-256: 4dcd7607cd0055b2214b3842268c608440d682c6c50a646b8b048c59dbd29e39
font_02_sfnt_off00015587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000194db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194DB 10060 bytes
SHA-256: c261b1a9e7b56da4f9ff62fc661a5938767a182775cb2ffdbbf37632089ed7c4

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