Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb25037a7e2f760…

MALICIOUS

PDF

75.9 KB Created: 2021-07-19 06:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bfc62143f8d525f11f674a2009fdb91a SHA-1: 868ea642e26a9051a00066e78ffa46b0e7d3cc6c SHA-256: ceb25037a7e2f760e5552addfa3d77587ca6d4fa35e8a7301f431618d13c83f3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous compromised CMS upload locations and disposable hosting sites. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment 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://ptogel2.com/contents//files/66508936115.pdf In PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e4b08115820---pinelumuxujisividisefame.pdfIn PDF document text
    • http://beta-rc.com/upload/files/kimazu.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tcb01alhql97r4d620rdp8lgr7/razuwasa.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077480746053---suxumofezodakevevu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeeb645099---13415420182.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3746140058---fuzezon.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/lebagowafeli.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/50269814665.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859980db3a5---pumijixifofusasonavide.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4462963f---visinobazututezelonokezo.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/lowemovapetedewarek.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5da155693---53694784722.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/80e4ad324788aec38f3e827b6911b295/mefabef.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/16655859780.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/wijiromejanitisezu.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/kifepiraf.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/zaxuzigunutobuvagigifa.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/ranodopizututaza.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/ad7a967d71568d61aae7d7b24d81f63c/rodamedomagixupulevif.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ac961128dd56f9824b2eb5e1a6ef42a5/14568423404.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608471c3e4fd3---26693786502.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/ximogododavizunoxesome.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/84296786546.pdfIn PDF document text
    • https://uangraja.com/contents//files/nadawonunolulugipafesin.pdfIn PDF document text
    • https://slide-bearing.com/d/files/doxamesidudijemoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=evidence+act+1872+pdfPDF 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_off0000c783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 10656 bytes
SHA-256: c500b0d7517c39f0f4e22def7d48f66df6976d1ce4110dc19d3a5208fdd42dcb
font_01_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 16236 bytes
SHA-256: db0b3abe24eba293a020810e6f070db1dc7349c9e77ca382527f08b877b3f4a6

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