Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c5309012f0587e…

MALICIOUS

PDF

80.5 KB Created: 2021-08-17 07:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c9b349fa820ec6a3229a11b529d2e91 SHA-1: 4ca9527f8741ca15cca74337b399ed57a9eb4dde SHA-256: d5c5309012f0587ecd0fced70947a69aecf59ed216ad3ad6f70883d852d043fe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many pointing to compromised WordPress uploads or disposable hosting. The embedded JavaScript stream suggests an attempt to execute malicious code, likely to redirect the user or further compromise the system. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://montaze.org/democms/userfiles/file/lapewefipafusafep.pdf In PDF document text
    • http://oilmachineydy.com/d/files/barevot.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t0m225hgqo3ougi7j7en9ll5p7/rexoximafivuferu.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/43254755145.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/dibefufevejiw.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/23358280070.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874385ce838---rudujimulib.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/93841717273285e222c77b9c444d058d/12735494533.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608848226b1db---23512338953.pdfIn PDF document text
    • https://anaksemut.com/contents//files/91146605410.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8755fcae35---95307522738.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/86727290447.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac3728b042---lufabaxo.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/60585454395.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210606_105831.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c143c76b0f---11473448908.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/v0n5i4gpm1j15ccaol0eknm1o4/50960347572.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/4445412650.pdfIn PDF document text
    • http://ridendo.cz/files/file/xawupejodeveki.pdfIn PDF document text
    • http://kasargod.net/uploads/file/73732729246.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/23089728490.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/45926610357.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/2309555343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=2003+harley+electra+glide+specsPDF 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_off0000d5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 16964 bytes
SHA-256: 2c8fb38671c9825a2cb8d9cbdbf5c188f6656a45d638ad11f47274fe9711511f
font_02_sfnt_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 11000 bytes
SHA-256: f71f63a82e1aa2a70de27831393a6034628968e2eb50a70edcdf3959e8e06e21