Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea73c3911a10c06d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 11:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8be795073c049314d4eeb4f806ba34f6 SHA-1: 4f77ec979a7a3efad9edc9a8bae4a825d7da9bc3 SHA-256: ea73c3911a10c06df76ba1a4529fe2f0bc27f404121654662f178eb4a0723f22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The embedded JavaScript and extensive link farm suggest an attempt to redirect users to malicious sites. The presence of multiple URLs pointing to compromised WordPress uploads and disposable hosting reinforces the malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bd9a7f49b---9788554878.pdf In PDF document text
    • http://theponghop.com/upload/files/moserupopowibot.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c07e8314f---81961346838.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/zexelevuroponipoxifimin.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/vokojekupile.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/vubipuki.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/74ceaaf344ef6d2cddbae66c97a3a1ba/ruwulujujor.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/45369912399.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/galul.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/genebunazo.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xilinazub.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/xisiraromebanapajofoba.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106271901598040.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39847161257.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/xitenutikagutalibiruweju.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/11709542325.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b5ffb5fd860b2c31e80665d03da2c148/reviwewuzusu.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/68050218197.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160910f9f7cc0d---35388494028.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/mawowap.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/53710975753.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/kejedibatenadomuxibo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/65397b66d801eaaa380d2067c0865947/kotizuvur.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/nekabinopudimavibisisake.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/webiwiwozuxewalejewoxap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=clicks+manual+breast+pump+reviewsPDF 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_off0000d799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 16856 bytes
SHA-256: b3d14b0bacf74022d50fa4f4bcb38034b5889744080fa03495227b5a4fe69fd9
font_02_sfnt_off00011b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 10928 bytes
SHA-256: ab02164ec5e098e87e95434aa1c9b63c53e54ce938411bc7fa8fe3700f4aa2d3

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