Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace9386fa34fb45c…

MALICIOUS

PDF

99.4 KB Created: 2021-09-07 22:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 425a5876d8aeea614b96c4f27965853a SHA-1: 9fa33dd07105cd27cd6a9a1e382524df3569f20a SHA-256: ace9386fa34fb45c16826a81585d0f75208791f39f535b2f31f00d18f14ff380
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/54b7a09bcb92ec3452e2d6032b96cd97/86584303434.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9e3870a04---padul.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/34865109273.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/47025416627.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210618_215007.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/kigutorasubuvilomevug.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/tjhtta3oq80aml3iu66i2inpqb/muneluvu.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/poban.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/43773670912.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c6f81447a---79217374226.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/47168389544.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/8260050554.pdfIn PDF document text
    • http://foxhill101.com/userimages/49030009999.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3247aefac8---92266918954.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/05b93fc5e4207eb84e8b6fb0a38b845f/71517294017.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/19055247572.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ead3088c1a---55463061171.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/vunupurozowo.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/49116724808.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/91345430905.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/40112209017.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/xitusosivaxuwekisabefo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be3aff09493---musokuwebogemaxa.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/gvuo7mq1m701pkpudt3mmslct8/kopurugatugojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=photodetector+noise+pdfPDF 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_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 10508 bytes
SHA-256: eb9a24c9ca004d62d07c69f324c1d7f77749845ebf75db38ba8397508b94bfa1
font_01_sfnt_off00013767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13767 19108 bytes
SHA-256: d9a973cadcddd2878dafceec37223c14ebc19ffff072e937d98a89765f11018f
font_02_sfnt_off0001688c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1688C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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