Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd5c68c9da14c11…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 18:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 861b64f5fb905cc4ee9522b8fc228d52 SHA-1: c75dbe41221cda212149bc951593d2aad317b311 SHA-256: 7cd5c68c9da14c1158eb0d292baf4d6b3f50c25c81f1209c308e4c6ce508d051
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16109fcc1bd3b9---22776863798.pdf In PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/rimudonagowenebinifi.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/88338692356.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160f124b04aa54---punexiwazej.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/paferefonokekexijat.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/71850338530.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1ea4e83e9767a77a587848dd2490bdd1/74178184218.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/88922656528.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/fobun.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5b2fae6b8ac46290d4e6581bbb6ad69e/57000138325.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/63846291850.pdfIn PDF document text
    • http://pensiuneavalentina.ro/app/webroot/file/bobafug.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/xivinurejesafubelajexev.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/dovadefawirow.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/21782083850.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/12816609736.pdfIn PDF document text
    • http://vodova51-53.cz/files/95096473481.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/kalopujigenatoxonozin.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/kivetevi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6197a1907e---wepofeluzasitibaga.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/10385659234.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/82666936408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=measure+for+measure+text+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_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 10612 bytes
SHA-256: d8ad3ef2ece15be1f97afbcd49778fb5675e2654f97ef4b6fadb4fbfc9f572d7
font_01_sfnt_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 17068 bytes
SHA-256: 8cabf67852805b20dfa329218156152aa10fd29a0524e9482b97316564ba66be

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