Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce28d96135f394c6…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 21:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f3cc9ac1b6c2a4d3b0419b5b51ebfda SHA-1: 5b446549620acac68749d716f054200e41b55e46 SHA-256: ce28d96135f394c677610e9d85aa7412ae79de650faf9371031bcc733bac8d89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of embedded URLs suggests an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=dnd+5e+dmg+pdf PDF link annotation
    • http://gikguamerica.com/userfiles/file/xejesa.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/53610807382.pdfIn PDF document text
    • http://juentai.com/userfiles/files/77283833014.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/61030424597.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/e8cb7287917866658b9e8ecae058a48e/18550651112.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306aeb46deb---88065750859.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/fepolakimirepabovofelojo.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/pijuwak.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/xozowarudabu.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/bepulefesa.pdfIn PDF document text
    • http://cartopack.be/Images/file/81712029891.pdfIn PDF document text
    • https://phukienbep.net/media/files/finedi.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/gimibonugogug.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/pifufovevezexavag.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/bulumabaxanise.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132d757215b9---10439543137.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/57431479990.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g9kkpdqm8e5snjj5v97r9lg4p6/57245722803.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3d9e7b1dd6eee493cf6dad70ffb0c066/pazaviraviwis.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/84604276375.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/bifiga.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/73865536296.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/pobopidujisogemomeluretog.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/pisawif.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/70388187284.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_off0000c1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 17792 bytes
SHA-256: 86fdd415a77c4c59f07133ab794254291b8280ede9f74845ad41e8e9a619cf12
font_02_sfnt_off000107fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FC 10188 bytes
SHA-256: ff838a21b3ff6970290f4996370a9fd47f9af7519e79547b3b23c0fd086a57e2

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