Malicious PDF — malware analysis report

Static analysis result for SHA-256 6988299d01554439…

MALICIOUS

PDF

77.4 KB Created: 2021-09-13 09:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e313cb4c5cb577bdb24ba92e80d78c7 SHA-1: a188e7718931029f4b46a163ce41277af3baa263 SHA-256: 6988299d015544396c3f152ea162e2d8046c1caa3cecabe49fcca7e1e82a2e78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://fitness-sport.it/userfiles/file/fiwadoruwijepapatetu.pdf In PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/a5hn50pjbod5kugkdbokjoitv1/fiwofoxegibuvati.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/rexowonivujofaloseperu.pdfIn PDF document text
    • https://fratellifurloni.it/file/46342555036.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/e1ae2840558fcb24fbf6c59f70e358fb/20372609285.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/lugokemojixekozozasedebag.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/boniravivuzukivep.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/tavorekupifazuwedumor.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/pifatawofofokivumuz.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/bijoroxaz.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/legiwududi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/61997745529.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/79911416390.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161302279ab9c1---80247576700.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/luril.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/62198023028.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/2546075844.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346b9dd6145---17857862357.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/tirewogopiweje.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/28196883519.pdfIn PDF document text
    • http://lex.tj/img/file/kufolejasozarawof.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-8/20210908125105159897.pdfIn PDF document text
    • https://reha.bg/content/upload/file/16922064679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pharmacology+books+for+medical+students+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_off0000ca52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 16516 bytes
SHA-256: 5aa0447b6029a3ea46a6736bbfd13c9321a3bd6e8c0191a6a0e3cf289b5e500e
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 11512 bytes
SHA-256: c0c2c68924c22469c2e6ecc2cb21b2148c8875f5ac9154fdbe88a8d79081b7c7

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