Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15e93cf0e938a51…

MALICIOUS

PDF

145.2 KB Created: 2021-07-27 21:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: df1de7d015f8ed873439ca557fce5286 SHA-1: ab5d3b28ec8d70672d6642ed31b5500d776194eb SHA-256: f15e93cf0e938a51f2af13a0026ffcee10db33da15de40b9c0b2037561bbfbf6
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to PDF files hosted on compromised websites, indicating a link farm or distribution point for further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9691

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a40005b9346---lizugu.pdf In PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/xonigo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/blau9f6um7lhcvnopht0cmger1/tumakinagezumedufawa.pdfIn PDF document text
    • http://pinxedien.net/upload/files/2156482522.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/29169265397.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/sc3bfd3ct73p2isoa827jfbhms/jiworaziliden.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/xoxasunirivisaxi.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/xiteluxavexozopolenup.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/70183816392.pdfIn PDF document text
    • https://ever-progress.com/upload/files/fifuvulagadodusuwapabotep.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/lobovolufutoxiraz.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb655580baf---giwawepudaveguguf.pdfIn PDF document text
    • https://melz-feu.ru/upload/wipesitixosirarefebaja.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d31c2ab863c20405403499bb874a5903/557727456.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/56477005238.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/f8rm0tqt574t44endaa54qek74/wupagexixozezopelasaf.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/80036041449.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1rpgjblpkvaih3k0j111od6vs0/73470329534.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c3fe1d4b8f332ea41bde2be61bb07384/78919632448.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h4aobmpegvi83jpd78dk3mvnv2/53429950688.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/mijelizexunixenomojedixod.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bce8c4f1f---27103948492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+are+some+landforms+in+central+asiaPDF 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_off0001d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0C6 10732 bytes
SHA-256: c15a4517b4fc927351067b5ad4265b6e0bd9f56e5ab371985855617edc01cf27
font_01_sfnt_off0001e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E940 19980 bytes
SHA-256: 412c309540359e2353adb9d0b522792faa25e5cab5f93add3515f919b80935d6
font_02_sfnt_off00021d23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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