Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65ca4eee13f62a6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-23 11:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40baa913830b8f355137a32af7ae5a0e SHA-1: 72c13aa9844fffa56c2b7521d406c19bcfcb8166 SHA-256: e65ca4eee13f62a6f837609b00f0842b80f62a2605c0d00d69b73bc0abbad5de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users into visiting potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://inwebjor.ru/uplcv?utm_term=how+to+save+excel+file+as+pdf+without+cutting+off PDF link annotation
    • http://adfaveo.com/image/files/20210923_084521.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130b16876036---98323638936.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/fuxukuj.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/t96i52fqde48v7khla7vod684j/12577262393.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/rawomogu.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/63164734536.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/nodipogozabegimovepezo.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/16532015718.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/zexuzonararefulamem.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/ladagu.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/44571729846.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/rivavonowexorawinudorezu.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/39121025574.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/daxaremifitirosipu.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/18976335751.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/xulurupetiresolobore.pdfIn PDF document text
    • http://topp.pl/_topp/file/31768479288.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/54782784869.pdfIn PDF document text
    • http://silver1979.com/upload/file/90461964695.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146d8cf8bd70---42837817760.pdfIn PDF document text
    • http://hanifeugur.com/image/files/sakupemajezakijesifoxa.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/49483414724.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/14062190876.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0153f18c---nazuzomesepoviju.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/70541443923.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/44903300362.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_off0000c420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC420 11144 bytes
SHA-256: 3cca5cc2f0db592256ed66546f768bd0682235d741299fc31717ed31609c5f45
font_01_sfnt_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 16864 bytes
SHA-256: 8cfab7510d6a72b14fc9dc77a573aeddb4fb85d12d200f4f12da5ce265982efa
font_02_sfnt_off000109aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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