Malicious PDF — malware analysis report

Static analysis result for SHA-256 25007d2e5767cf69…

MALICIOUS

PDF

90.9 KB Created: 2021-09-19 08:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5606833ae883365bce330c82c6066c49 SHA-1: 453d13d333528d8dded153d40d0664922b30d2f1 SHA-256: 25007d2e5767cf6989a89c8f2f44d541a0875d8a1be0d65f1fd499ee61da9ac9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=com+bi+cha+suon+nuong PDF link annotation
    • https://luxm.pl/userfiles/file/95083855649.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614355a3332a8---wamevesesevupi.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3519a9b88c859c7c85b9fbe6a022c34c/66889376054.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/40919455682.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613405545c0ff---40132606822.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/22030433446.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/fuwitowofupexepijifage.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/91986476018.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ace8cbc621c306fc3601b2f12905eeb0/24618414821.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/nawurokamulazulodamixipe.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/petomizuzu.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/57299474293.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/85017674839.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5783a2abf8dfa68240d03fb5c837c1e5/veforikaxagavuzovi.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/winudajulimi.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/29486897051.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/vafugukusovaxekoraxusebe.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/lozudajasosazulerosadiji.pdfIn PDF document text
    • http://ipublicity.cz/data/file/firotidexedoki.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/87341285380.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/41984411225.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/verakigakote.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/kibabemazobefixirujokopi.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 23852 bytes
SHA-256: 35cd44b222abca15ea977f0a356c3136df7f569217afa00189941262bda5aae0
font_01_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 10572 bytes
SHA-256: 69652cbd9c3b76cc92b3638d70a525604344057ec366c39013f25d2ddc0f535d
font_02_sfnt_off00013d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001554b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554B 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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