Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c167f31e719cbe…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 01:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b8599a4f4fd67dfc699d6225a94d07d SHA-1: 16bc13a14a48e78e95515cb78b2c57b337b02521 SHA-256: f2c167f31e719cbeeb5d8ff258be1ca319c16d6e3fdcad05fb0d217be657d033
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, with the explicit intent of luring users to download remote-support tools. The presence of numerous links suggests an attempt to distribute a payload or facilitate unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://tannhatviet.vn/upload/files/19476593858.pdf In PDF document text
    • http://toitureetfacade.fr/data/Files/zexenuvuwiwar.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/1514861485.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/wefasewosemuwif.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161362a2e74a71---nitabajiziliwunasifabizem.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161384050dcbcf---xorazebegeniwopodubilude.pdfIn PDF document text
    • http://agmapure.com/upload/files/misomumama.pdfIn PDF document text
    • https://diphong.com/uploads/33506576460.pdfIn PDF document text
    • https://digireg.com/upload/tiwevisirujewadexex.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/32021485660.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/poliwumefekugijaminomab.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/wotidisevuwijulijuwevuto.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/zamilofidogufe.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/rowixaxaxeduvugul.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/madeluwuzokedubofu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161377229de6d5---47589332729.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309730a79b2---sikidax.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/wilotafux.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210907_173132.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5a4c6285800bf3f4e9273e5e56f70eff/65826642470.pdfIn PDF document text
    • http://jaqalsports.com/files/file/40641158898.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613581c08bc2d---zujepinojokezam.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/13701235924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=logmein+android+app+freePDF link annotation
    • 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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 10488 bytes
SHA-256: b5e3144be3545a5db7a0c9b10cdb3aa183568e4fd11f265c3cdabd4d308c0ae6
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 18296 bytes
SHA-256: 5df5da5bea8abe3c06fb3d8bcd17ccfa34465f50d1761fa2dc4b1f14c1400bf1

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