Malicious PDF — malware analysis report

Static analysis result for SHA-256 f059cda68448314d…

MALICIOUS

PDF

82.6 KB Created: 2021-08-25 21:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d1e371b3ef97f9d3d4fffd7ed993c34 SHA-1: 508f195b892374baf7534cdff200ea763bb540be SHA-256: f059cda68448314d7701a28fcc16c51db82bf22d032f7eac3146703b4f11ce4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The file's structure and embedded URLs suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://sthouseluxury.com/upload/files/25221582222.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/55hnn9n2cmq7sqi0cbhkuntevn/zakizageverak.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4b18a91882adef3a335961b4ef655e94/97447494481.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/38350232839.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608708523181c---92946308701.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f159938f---votakub.pdfIn PDF document text
    • http://brlairport.com/images/file/50794327041.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/zexakewos.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/gunaru.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/22chs5nvf50c2cqt1pmdlv17q4/masazegitajugiribamaz.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/49429003576.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/67793331462.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/46988466426.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f741680c7c190e33966d20646eec7c37/sanidonefe.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/gixesosovasoranufujogobip.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f38cc6316f---18468231866.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/93876792518.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/mabixupevawatusid.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/67883634630.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/niwuwebonejalepe.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/zerim.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/togojifanagadubixin.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/78315879364.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb69ecc37e---zibimeborotabizebekawiz.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lq7m6k3m4u0e2ldblmddkpcbfp/58368390121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=easy+chicken+pot+pie+with+puff+pastryPDF 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_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 16964 bytes
SHA-256: 2b3198354b9b624e7becd56b94f968a3d687cd744c9249a6fad0522749473af7
font_02_sfnt_off00012365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 10904 bytes
SHA-256: fe68a854696c900e289b07c58126b32426c59320cb9ee3ae26f4a6a19406f740