Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ea987c8d179ba1…

MALICIOUS

PDF

103.1 KB Created: 2021-09-04 21:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2b87edbd9c68575913946dffad1827b SHA-1: 4e4d0406529933ebdf0b8afab123a0f537642d78 SHA-256: 48ea987c8d179ba1da603fe7708f8d96d92a04e7833e3a39345412dc55ef5f38
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The heuristic firings suggest it is designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161138c80eddd6---72054803523.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/76fca49ea9f17c992de69ebf4504f1d6/94996265405.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c995fc95fa6---vixatod.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a20b14032087dac7fc9380fa8a8009e6/15329097368.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/57734221464.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/73657362309.pdfIn PDF document text
    • https://bloomeng.com/uploads/78619602541.pdfIn PDF document text
    • http://hkalc.com/userfiles/44504532327.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/gapitojijojuzizovuli.pdfIn PDF document text
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/rarafoz.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cea2c126fe---58890851599.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/j9jkb0637tcnk5vpvdmji9lqqp/wafinaderezixiziv.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/jibigatapolabudosizizodew.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/dujizovubulimasimapadun.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/11092275880.pdfIn PDF document text
    • http://russia-ex.com/49824838354.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/7933230047.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/nozavemajamar.pdfIn PDF document text
    • https://southafricapools.com/contents//files/berexa.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9978bc2fced13d6f2dd1dc442fe801d3/66068309719.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/81644380738.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/0lip28le8q1km2pom7i1pttetl/lepitusitelijululixi.pdfIn PDF document text
    • https://vleek.com/uploads/files/nopiwelelivopet.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d629b0b04bc---pomet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=carbohydrate+metabolism+disorders+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_off00012be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE7 18920 bytes
SHA-256: dc62e01c9ae53c45157c84068bba93e022c608626ec970d2c4e5539722c817f5
font_01_sfnt_off00015d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4E 10944 bytes
SHA-256: 639c4ac73fa010d40caeecb277b6d26bb10b1aa95bfaeaa6c87947dd8f06fc3a
font_02_sfnt_off0001767e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1767E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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