Malicious PDF — malware analysis report

Static analysis result for SHA-256 a127ea1ecfe7575f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 21:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c913b3f6552d118da083f92767911c4 SHA-1: 34610b4bc4271a62d85817e091372b1f1bcf0e0f SHA-256: a127ea1ecfe7575f9c63ce20f96746b0d66836ae4e0d54e74d029ddba2f55dbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studioaeditecne.it/userfiles/file/78722763826.pdf In PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d0608202---xunofereserukutegega.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/59003696670.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/lilezaxivitu.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/98270044273.pdfIn PDF document text
    • http://recrute.fr/files/files/38892016107.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/kepuramu.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/73366272862.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/74105748435.pdfIn PDF document text
    • http://videlec.be/ressource/file/21252366243.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/vufagumalujodilimowadeb.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/88524826631.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/dowixifiz.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/disikabebe.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bb6e52788---28013353723.pdfIn PDF document text
    • http://coumert.com/images/file/nipinikiluja.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/devakeveretigokezas.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/98293188711.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/11757613081.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/58501964528.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/17136397182.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/xesamebinoxukunut.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/13875399672.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/b706c377c1f16ed78a50f66aff14a58c/75718079274.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/doxowat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mobile+games+with+controller+support+androidPDF 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_off0000c058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 11280 bytes
SHA-256: ab175de63270942997da86da98c61c3db95892cafdc70d862a8b11168814d89d
font_02_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 16316 bytes
SHA-256: 78dfcaf05743f94b85387a63e85e200228433d80003ea590b8f30ee4d55cc464

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