Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c1042de8f4dac0…

MALICIOUS

PDF

87.9 KB Created: 2021-07-30 12:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6b1558a0cd0e777e3e771303860db7ba SHA-1: 09aba3117ba926e9f60cd58970392f8f45c74c44 SHA-256: e0c1042de8f4dac0e883e55d7664a460b5a5b855b28e0e97bc9885092c50deb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI links. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening the PDF. The linked URLs, particularly those pointing to compromised CMS upload storage, indicate a potential distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0bd7b3e038---makaz.pdf In PDF document text
    • http://anandtouristcorporation.com/uploads/52606572069.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf30b21cae---pugij.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a44c51cbc---65956404843.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/57463888880.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/naxotojiv.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qtsgvplt8c7qa9hgsi91nhvlf5/65537427255.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/fokofezivipetufasizoxu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/cebfee3c898ed260be76e45e3fa98269/9865186096.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b01a0146f---bupixusel.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad63b947a34---wekakuluzigaz.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/gixirurunosuvogogaxoj.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d48934e39---50870487972.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/sivamupilozim.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/pibateb.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/paninugukakeme.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/nowaponu.pdfIn PDF document text
    • https://marosme.ro/hirek/file/43302635595.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/dubaxumapofajisasugajon.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/76231457057.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210722181648.pdfIn PDF document text
    • http://farashimirooz.com/files/11017295899.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f73adace7557edf1bb4ef64549a983ae/tuvazabosakiv.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/metaweguliveko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B4%D1%80%D0%B0%D0%B9%D0%B2%D0%B5%D1%80+%D0%B4%D0%BB%D1%8F+%D0%BF%D1%80%D0%B8%D0%BD%D1%82%D0%B5%D1%80%D0%B0+samsung+ml-2015+windows+10PDF 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_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 12648 bytes
SHA-256: 7f4d727307d37868e67173229cf70f97769c22525b4b865eaa41f6cbd4b66ac8
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 23500 bytes
SHA-256: d2699e4bf41c3366bd35183b5004c5b7cdda0e70a1e25186c6f926be7109ae45
font_02_sfnt_off00013670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1