Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde0fc6e59efa942…

MALICIOUS

PDF

91.2 KB Created: 2021-09-07 05:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0e3d568150560103f300c8f717842ab SHA-1: ac7adbb8d6fdf02fbff5dc11e3103f9cba63b6c9 SHA-256: dde0fc6e59efa9423c8ac4ec7dda762783fc622bcdd266043cf92943e2f34edf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. An embedded JavaScript stream was also detected, suggesting potential for further malicious activity, such as downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076ceed1097e---nozit.pdf In PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/zolalasakew.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff03dccc8---damokikajatixi.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/muxitomis.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b126265ffd---nolibonubobana.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/mubaparejumub.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/10392929858.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/9196136156d17f3ec52225b6de16ec63/30910707618.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/mevelaxekow.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/25712419879.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/93611456777.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8f64a5f8e5675c76088ef20be8999d75/razavimutupunozabomevi.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/fehvamuat2jhvi8l0in66fnvut/18902869557.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210811_0465341D34487B56.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///rizogavob.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/webobemozoredomanaro.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d05bdbd1d62---logetofifomoribim.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/wagajejiwipabovolif.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973c12e3a3b---jifafokemeji.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/004f0b6s5g2c3p0clogohsnlg7/xodex.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7d0ce28ea043bf789b99d3971f022653/lapasijin.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/xisisofigexiwinexovebomez.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/0m29jo7jn2coc5q9svdsf73j74/fukunisakimanomevu.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/15123487612.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21440c50b---bosubariwajabikalop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=water+supply+and+environmental+engineering+book+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_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 11348 bytes
SHA-256: 04ace55380d945c48afca4d47713c89a816b00a826d2d1dd4ab2ab2ff1e42528
font_01_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 18588 bytes
SHA-256: 082a6019d5c4f8e56eaf0fac84dadf931a6ec7a670f0de136e81ad96c20d8655
font_02_sfnt_off00014636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1