Malicious PDF — malware analysis report

Static analysis result for SHA-256 f282be277bdedbb0…

MALICIOUS

PDF

77.3 KB Created: 2021-09-12 09:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3ece93826871899e8f3ce53b477927f SHA-1: 8fb5c3432ec07330b910b5c9c9232ab83bd8303c SHA-256: f282be277bdedbb0108daf23a01f99a661685fa814f429fc4718d2e662bc4532
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely used to obfuscate or trigger the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=town+games+for+android PDF link annotation
    • http://lagunaapartman.hu/images/user/file/fizonenizi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/h65csgs2n364s7npbnlh6lmfc5/vimomasafodow.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/38634284513.pdfIn PDF document text
    • https://semut73.com/contents/files/zedogenoxozexone.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/jevezir.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/t8hl0d454opgeockiao0le3utr/62382400064.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/23330203675.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/72373530551.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/vaxudasudoxeter.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/6597798228.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/melibiveninebi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebfd216c4a---ketuvupopumapor.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/27755033193.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/74795648861.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenitowi.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/bofejubokizafakememobujas.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/11852987726.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/jomewenagukupimew.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/faufkeof877057lbu9d9acf6c3/piwuxobidatuketimapigepe.pdfIn PDF document text
    • http://hainfelderteich.at/77874358596.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/87337329340.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/sonizofakiwasowirirowugex.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_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 17208 bytes
SHA-256: bdf5885a0fa0f763e70fdd054c5ff8a8e593b073449d7ea2a00ce602f591333e
font_01_sfnt_off0000f758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 10600 bytes
SHA-256: 0d6e7f2f29671163536455ebca63b46691f87ea934316327ef5d62c7db1a297f

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