Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f7907494bb3522…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 04:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ca522d3eabe119278df7875a93f6425 SHA-1: d38bde01d42d3407573be1ec7572bdd80164650f SHA-256: f1f7907494bb35226c375ba72c28ae0d9fe0a3ff496f6320bfbb2d67991f277e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript stream and ClamAV detection further indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious redirection scheme.

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://drafthe.ru/uplcv?utm_term=pdf+xchange+editor+mac+download PDF link annotation
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/paxaxoz.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/kufepitumekusu.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/baguledijazoxosejemadud.pdfIn PDF document text
    • https://steammining.com/userfiles/file/lebonon.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/bumegu.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/wososefanitizenaral.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/03663070257396de00f070ba12dfe776/xujeferej.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/bomolimofatumajegusodelij.pdfIn PDF document text
    • https://path.mn/userfiles/files/ponoxixexotuw.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a724c07e91---53528676490.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210616_305451ADEC9A29AC.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/jemakarutuxokiwumador.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/letosopugisematedig.pdfIn PDF document text
    • http://zae.me/datafiles/file/bowoxejafolelipudedowu.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/tajikanasiwurenugulugif.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/fiqvf9fpa5bl41903oh2umseae/rizetu.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/s2kfqorb2fgvbgo87iulbvj7et/93267278630.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/96635393178.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/wavumaketop.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/58050184539.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c420e5c31e---68578347082.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/6661718214.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/18800844977.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/41959833894.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_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 18460 bytes
SHA-256: a34af552041293c8513f80c8003cc5b5156b8b20a2d3f0119891432f54a9d3e6
font_02_sfnt_off00012bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAE 10944 bytes
SHA-256: 228a6ac5d0b6bcd3905a18c043750cb3a7c068e4e738f2ed8d89023da5afff83

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