Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e3e774bd5c03ef…

MALICIOUS

PDF

87.7 KB Created: 2021-09-05 10:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 868dd65491aaf4cdb2d80705ed1019a8 SHA-1: 901b94e844453c2a61830648fab5bdaa55f6bd01 SHA-256: f0e3e774bd5c03ef170e5ef2f67f707afe61bd8be0e267e710c1093d49f47b9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tradeweb.es/userfiles/file/6133121258.pdf In PDF document text
    • http://dongkoo.com/uploads/editor/files/30631377970.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/26599016076.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/xitovajidilegizurilegivo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be4f9753f---degoxadibutazazuga.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731d76294e3---dudidoxejekuvefali.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/bikamedusepoboxabilonudem.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0fc00699---94254012038.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/jaxumil.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3466086a68---wufebor.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe878c0cd93---63361711677.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f680b5b61---gujetesadajer.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/belesibifewikonisepoz.pdfIn PDF document text
    • http://zeci.nl/im/image/31289653540.pdfIn PDF document text
    • http://isvpro.com/custom/files/85694333976.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/zukupinima.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/tofikaso.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/ripiki.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5ee17ccef---jemedejaroburobazim.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/89186415294.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/fedoketevu.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/tufegunamirer.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/32849794717.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609a49471a569---11627829991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pannus+mata+adalah+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_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 10420 bytes
SHA-256: 09ca62740dd8d8ba3e4aa1c9f4ed57467f8f123d5fe6cb8e40cad45fccaf59d1
font_01_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 16624 bytes
SHA-256: f066e1948428634ac93651781bc970686b47c02e8e55e3095a5bca73a6005932
font_02_sfnt_off00013949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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