Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce395aeaee7fcee0…

MALICIOUS

PDF

91.0 KB Created: 2021-09-18 20:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef7358acc8cfdeb814230792a7ef6dbf SHA-1: 77a12775ec19d51fac5c86bc7da11b0c4a66d14a SHA-256: ce395aeaee7fcee0ebe99047a877b274182869e12c25eab96c82a8cf15488b7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The presence of embedded JavaScript suggests potential for further exploitation beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=ellen+yee+birds+of+prey PDF link annotation
    • http://factory-01.com/js/upload/files/84882661310.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/putudiweruwuninis.pdfIn PDF document text
    • http://infracsap.hu/files/file/92126451735.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/xilutajupawijaki.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/36689862985.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/09cdf175c307096aa5823dff341a2633/lisob.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/98703994382.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/24212704094.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/39249901026.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131007498b17---deregete.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/virikuxojomaja.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/94909937983.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/43789381554.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/bamidajitew.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/1a9227b12dce8d41932b91cef2faab5c/kozaxexi.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/6121073404.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/poporemenalefugaledipipip.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/ribunoburogugene.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/af02a9b3dc0ae6cd5151131e9934be57/gugezilupugadexusilolafa.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/42768096712.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/88419707734.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10366033505.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/zosusisopewolila.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/razoku.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_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 18244 bytes
SHA-256: 4a4acbcddba35c7489a295f07c3440a6630333a2fd3b3987d4eb966264992857
font_01_sfnt_off00012f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F15 10468 bytes
SHA-256: 0e6668d9db4c7c9f07c4c40347fb90db8d6ac3feb3bb866d5abcedd4c3292189
font_02_sfnt_off000146ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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