Malicious PDF — malware analysis report

Static analysis result for SHA-256 68c11a272b61966d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 09:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9065965266904d4f72cf1a29dfbd10a SHA-1: 58fae8e23bf1b729bf3ab71f554a57cbe24e87db SHA-256: 68c11a272b61966d2fea0885111bea190af479692ec6197f80258b6e21c88ef6
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. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of JavaScript suggests an attempt to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079267b1d240---31907608410.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/d65c2e9a4070fe2efc1154289da6ddc1/64864118367.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b78b7d61f4---92817502416.pdfIn PDF document text
    • http://kiameds.com/images/upload/files/52988807124.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610884f61ee73---12042692071.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/36809879235.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c4a0f7e8---zofesalupelosesaba.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f125fac8ea---86591729092.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4lobmg13novaa3qstuo0c102k3/juvakevuvuxuwevirofunaji.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/67602826410.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202159155107537.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/14185024248.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/remananas.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e4785b6f1---68947981057.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/senusad.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/15113303771.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7be59a4302a10cdaa1622f25062536ef/xujiminadomevovojebeti.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f30b56748---12507870818.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/71329519203.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/toladasen.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/58358476769.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/29619644231.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/613098619.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/83309945263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=road+signs+in+the+philippines+pdf+tagalogPDF 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_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 10724 bytes
SHA-256: 76ee321eaaf83aebdd5122e1c93ae18c7789cc5512e1bb4a803218c795654dbe
font_01_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 17476 bytes
SHA-256: 6ac3d08052e9a4d6e3545aeba89c122ceb0ac6b35f87995cc33ee0bb1b8a2afc

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