Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc0fe0c864cf858…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 13:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d976809682759b8fd8a844c223bfb5a9 SHA-1: c447b0986b80338ae0706e0c9d85bbe38ae7023c SHA-256: bfc0fe0c864cf8588fb8ae438ecce954eda7ff84164e5ee1d91341d2d381ba7c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=overleaf+android+app PDF link annotation
    • http://sin-hua.org/userfiles/46696872035.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/96358132470.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/zuxen.pdfIn PDF document text
    • http://silver1979.com/upload/file/vuxevogimusuraweguxofi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c144c8d64b---remanas.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/92183528942.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/25349362756.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/tawibitebu.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/maludunemunijosu.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6132FFE413C07.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/wafowobi.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e1e2e26761794a6427562e133b5608d0/49019620481.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/pimonanabusur.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130695cb90e1---9091179803.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/dubukevegixenulefik.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/81117136379.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/vazemovupekepejo.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/34169223284.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/dozozofukituxaderovapar.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/demazetisaja.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/54048574384.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/11665623659.pdfIn PDF document text
    • http://precisao.net/files/files/gekovovunewomudekob.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/54121820260.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/wujer.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_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 17116 bytes
SHA-256: 34ba2a81a3d7a74dab53957b0808ffc358147a4ba73dcf7d1c7e16af9ba2b556
font_01_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 10316 bytes
SHA-256: 943178081f30b3b8e9e9f383dd7d2e2c7bec85ad5980fef88daced3854cbd1dc

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