Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd1410a6b5431bf…

MALICIOUS

PDF

75.6 KB Created: 2021-09-22 10:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bb8be014f9fb50dd09de8a92b8ee156a SHA-1: 2c120c120f4a789dc64d6f8c41065905ac1da956 SHA-256: ebd1410a6b5431bf8f931b281e72d115ed64f6360673474edc7ffce826bd4d0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates an attempt to leverage SEO or compromised infrastructure for distribution. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to harmful content.

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://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/duvukorukofegunuzusegakif.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148de8487e4e---bodivapijetugafixala.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/57025041521.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16149d08f83fbf---82302445421.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/joreg.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/lezew.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/daxapifexefot.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/66067774162.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/21320225811.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/17665565628.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/vifimenirozigulej.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/3929625859.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/zinapupelu.pdfIn PDF document text
    • http://test-immo.com/file/7994231969.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/kuxukuxukotake.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/bibav.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/bitururegux.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/015e7ee54958cf092b0f78165127d072/rojol.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/bkcdj8g1ch1194c0pjohnaisl1/makumoluzojomafe.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613333e4e9545---25888362465.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/90720197787.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/74f9b2c1034ab028ffc2a1dd43e6e08b/denabe.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/jununamawurir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+insert+a+video+in+a+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_off0000c569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 16648 bytes
SHA-256: c66b5b729376e3e6b6cd496488913a39ec4bef07d71fddbc1d64cb41aab7df61
font_01_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 10588 bytes
SHA-256: b797b0f6a0079e629901f44af75732712a61a54cfdf1b0ef5cdb857b63905875
font_02_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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