Malicious PDF — malware analysis report

Static analysis result for SHA-256 540845b7273c60cf…

MALICIOUS

PDF

99.9 KB Created: 2021-09-07 04:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 566f729dc7a069f1eb931125d87b29fb SHA-1: 1ebc495e35d61b6f0c647b00ba893b0bdd6aee49 SHA-256: 540845b7273c60cfde0933d0ab0879f6412d589f87132e1eb2e716c7c700aa5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a4639ff9f0ca662242e16aee142c0d13/90125309632.pdf In PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/5701737738.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/80198188557.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/podixisozikexirinokusuxog.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/gogokela.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d240724ec5c---47332419247.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be8c91519c4---tamimes.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1b7c4ee20727b2c390adfff3371b5d4b/tuvimoluxedemezavipo.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/22875391777.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/29f07045059ba76ff83a63d750fcfbc0/tuxuxekifoladalanikew.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/xazelux.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/gitoxugemojaxuxewufebi.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609883877421f---22274304837.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15a6f3483---losuwowetodopotodex.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/96027843300.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161342d9e40b0e---66496956183.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c8158bbd---4851533531.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9f883a877bb3f8b1f81143c306a4b3e0/42070436237.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dc95b705f2e---depawobufuvus.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9dbc1100---884824890.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/petopalofizeseranukupo.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/af47534ca11c4a0754b49c04aeeb94e0/54037220525.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/kunupikalomijederojafe.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a05ec18b6---78873010142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+extract+text+from+pdf+bluebeamPDF 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_off00011ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BF 19464 bytes
SHA-256: 6f6e5105a232b7e1d25e53468eeae95be3e9ddc91cff635865d0e932b1ed77fe
font_02_sfnt_off000168ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168ED 10836 bytes
SHA-256: 28e03220a9c4e660bb26f7631c921dd2910b3912d8868f5e55ba5be35858db68

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