Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e929751f0dd5b6…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 03:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bb122021d3584b7c6e521d7cdfca1cd2 SHA-1: 250350f2a165b00213e0c4144b48df28e92e031d SHA-256: 06e929751f0dd5b6ba5af778cd49ffc605343cdd969ee44b44a4e5ffdf41427e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the extensive use of external links points to a watering hole or phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://coretry.ru/uplcv?utm_term=panatang+makabayan+new+version+pdf PDF link annotation
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/ganumugivejiromezi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/195d82604832703bfe558c4d38dea683/vagufafitev.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/33a671235fed240d017ba583604f21f3/35919256817.pdfIn PDF document text
    • http://devison-matras.com/upload/file/tawesigomajap.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/54910045643.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/89955580eb93db49b1a924dfd9f592ad/dekogunawam.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612bbc7aa9389---2035694812.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c524f69abd6---vidoruzeliguwapuzopiz.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16114a65b60d23---36932042285.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/29719437971.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/musirol.pdfIn PDF document text
    • http://lucann.com/Upload/file/87889838959.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/jezabomakubinipipokisulul.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/s9p6gr69qr8971pqoili18v0je/morisasivipujibekuj.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/71194165514.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a831ed71954---54793516289.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/fupugutox.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2a7910688---70930235337.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/dupejubedowokoxavekejuv.pdfIn PDF document text
    • https://virker-ikke.dk/files/96272473849.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/555e56639ffb65325508db98233c8eb7/68048343803.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6ba6a0eea718851262d2649e16e2f461/xerupaxeruraletabo.pdfIn PDF document text
    • https://kawanmto.info/contents//files/fupogiroj.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/41849468609.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b92395c4---damulazejopedin.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160941491881c4---ravutogedovudixibu.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_off0000c414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC414 11292 bytes
SHA-256: aa95125050dffe2924671efee1d4ebdbbc7fade7635f3b579623a02c5dc9f8d8
font_01_sfnt_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 18176 bytes
SHA-256: b70dcf187d20774b4a5340d6a51302cd5ff4212730f5277d8553b46d0f8f3122
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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