Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc086c64150eb845…

MALICIOUS

PDF

77.0 KB Created: 2021-09-24 02:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b331cbee919b17c5a3ac5f79b30a0782 SHA-1: 37c29641a5735467fee32163d273f747b317c0c4 SHA-256: fc086c64150eb845cc8b6146f5dc3f73fc2ec419edc983b686870e9ac401f0e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm for phishing or malware distribution. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the links point towards an attempt to redirect users to malicious content, likely disguised as desirable downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=asphalt+8+hack+pc PDF link annotation
    • http://talcmanagement.com/uploaded_files/userfiles/files/37397489327.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/13841991631.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/besudusibanuliwaju.pdfIn PDF document text
    • https://la-klamm.org/Files/files/87976378233.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/24656487740.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/ganetuwurixosunav.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/61nl2n0pmak2f12t17posuet07/femolovozagezuxubabosi.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/nazovabonuxu.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/jusavakegubeliveludigid.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/i978uq3kgrdk6o9c381th6v3ii/49416386490.pdfIn PDF document text
    • http://szhlfz.net/upload/42326184164.pdfIn PDF document text
    • http://szm.hu/userfiles/file/1053745592.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/603b785036a27a32acf5b7fd16594f18/94374097021.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145efb2e4a89---sivazozasisowejilane.pdfIn PDF document text
    • http://skia22.ru/pic/file/rebitobodafopav.pdfIn PDF document text
    • http://klaaswester.nl/img/file/neziveduzawulamenukiv.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/jofukugokovapizogaz.pdfIn PDF document text
    • http://www.perlodrink.com/documents/54099175981.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/42062223413.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/kirebi.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/vofabalodujiladij.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/tebubomokaxibunisaxi.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/felefoli.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_off0000c567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC567 10204 bytes
SHA-256: f88fd617fd92791463fce10f16046b90d5429af122ba14beccbe7befcab3b3fe
font_01_sfnt_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 18956 bytes
SHA-256: 7d9d000c16554d11b89282c85905e46b69dee5bd8bb48e11ad1b5c33e8039293
font_02_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1