Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dec007215208a22…

MALICIOUS

PDF

77.4 KB Created: 2021-09-17 09:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acd1baf010fab616a0449b7f0d3b2c90 SHA-1: 25fd1983cffeb6009c7bb7fe5d5e699c8b2d4508 SHA-256: 8dec007215208a22f0b02ee6b52966ce33831bcaf55fa923c0aedbcc3d7e9726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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 http://www.ecostroyservis.ru/File/42367007565.pdf In PDF document text
    • http://pneusmarene.it/images/file/legakixutosalexawofen.pdfIn PDF document text
    • https://dhesient.com/media/36311731541.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/80824559949.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/2597029500.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4610473c---denalekiwerotabawojegako.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/kiwapisejobijirilunenek.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/zefavorusen.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/pobasopikuvupununuvedeju.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/23654709962.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/zifuwibifowunuzutasati.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/tivesemevafubiminuxebas.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe590d8c70---78726865052.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/rezesulofedaluzijosem.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/9404480158.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/powodob.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/tosibebufuwilep.pdfIn PDF document text
    • http://hotechike.com/files/files/13848969189.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/kd3sqj8ja9uu07ffkjtu99j41k/zupidutetejabenijiw.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/759bc2078c8e67c64bfd27cbbf4dd81d/22840965622.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/73798431372.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/biludevugiwizi.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/97103594066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=clear+ram+android+tabletPDF 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_off0000cc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0E 17216 bytes
SHA-256: f75306fc1180993f8dbcf021bcf45b1de6f197e5b321be95a300ffa04ebe1c1d
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 10412 bytes
SHA-256: c68fa33d2f8f2c375acd5bb01ccf8df5499864521bd5eb1e0ce0e72310005a92

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