Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc86594c55ccb4f…

MALICIOUS

PDF

112.6 KB Created: 2021-06-26 01:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d776242df82fcd6c8481b781dfe2be8b SHA-1: d1bb81c608f4edfddaf4c12da21bc894fee6eee0 SHA-256: 1bc86594c55ccb4fb971aaf1a7ba6c9d20c43ea0482a14c66b40d241c4b53fcb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised upload paths suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ef4465283b652ed13fe8ee195087a088/zurutexa.pdf In PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xisesivadipemulasagom.pdfIn PDF document text
    • http://recrute.fr/files/files/19544064468.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa16524d2---pipututulesojajirojejik.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a572e7346---27310405571.pdfIn PDF document text
    • https://educhina.mn/editor/files/69608163833.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/bc505992fe9175a8d0d7e9a79e3fee90/17624623197.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9dde4217f05ce769bd3f9f309efb5e8c/vamabatejokalukizafep.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcaf30836---najejote.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/g8c3pipqhccjcoq7ntjft8u5v6/rugogutuw.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/75190095370.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e90a55bfadeef0a2d01e0d26213592b6/9650353061.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2ca70bb29f9c8d68631f8b03875b1af2/vogavuvojelapuvum.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ccb6cf565---fusixax.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/755f9592677312b716385c048b13b269/14794270371.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef233ed9a---16553939500.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/diwejisenaludobamodif.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1a94fcc2---37126431840.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/14400094317.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bd5b663dd---mugabowaxifelafetujabose.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9dd6b129c---48407212220.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/kififefir.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f179049db---90823329605.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/70336783820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=barking+up+the+wrong+tree+pdf+free+downloadPDF 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_off00014f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F3E 20432 bytes
SHA-256: fe80199cbb2ec709268da58a281ed51616a4c9246ea233cfff4b26e7100d8e4f
font_01_sfnt_off00018399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18399 10940 bytes
SHA-256: 8e2aec66b600a01f4aa19de595a63d5384f32743360b1625a87db6dce5caccb8
font_02_sfnt_off00019cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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