Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23d0421aa2c2927…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 04:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a9db4c6e8d99042e363c79e8b5c9abc9 SHA-1: 82e6d84938bc5d420bbbcd52c0deaebbf8413ee1 SHA-256: d23d0421aa2c292742d4d4d2f528f38032a8780c5f1ed9203b22fef7c7bf68cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which host other PDF files, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports this malicious classification.

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://infotechb2blite.com/bot/ckfinder/uf/files/89917683217.pdf In PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/38208176289.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/siganoxixepiba.pdfIn PDF document text
    • http://ombs.ru/uploads/files/87009755903.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/kotizitewalivojusogo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2df45af276---22078291817.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/zaxikukikelonoru.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/772e96281385882e04fca0085eb5600c/pevita.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/8e320706ef51a2945ccd884bc2992edc/48791105252.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/56308268400.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/1476713647.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6954e0e08c5aacb1b99bd41d0fb9b5ec/lusilerinexoreneperup.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/83704721496.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d610a0c1f6c07d3db4319ca08ad3c35b/zipotunexadeguzodev.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161035ac1db31e---tatenadukesewalos.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/7376227887.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c8ce07c6---37778306720.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/xaketife.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae73a5d66---jomajuxuf.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/pixofilononisumer.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/48423803049.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/71553028561.pdfIn PDF document text
    • http://effekt-film.de/files/file/gozigamiwokuvalamakolaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=central+nervous+system+pdf+filePDF 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_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 16736 bytes
SHA-256: c286532c0f930509e57594e6133317d1a70841a8cebdc19fc89abfee8c8ff4b5
font_01_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 10968 bytes
SHA-256: 15c928dbfb9a995c0c88aedb7f3a011c9e90892a099aa3849f0057a3f858ebdc
font_02_sfnt_off00010b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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