Malicious PDF — malware analysis report

Static analysis result for SHA-256 da08cbffb4eadd8d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-04 16:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b81eb0b39916a47091a9234e895c4e2 SHA-1: f83474016bb9431a14c9c0e93b7cbafcbc281e4c SHA-256: da08cbffb4eadd8db3bc2a32fbe4e1bdd772ca8e2c9b78727ab62bc9a6063313
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Multiple heuristics indicate the presence of link farms pointing to compromised WordPress sites and potentially disposable hosting, suggesting an attempt to distribute malicious content or phish for information. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/62560646181.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b1b6a3414---lesadeperofekuw.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8fe66759d4ec5aaf0b8b23fddbd6e010/49429634173.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/m3o7ddgntp5kfeq2r4ehtin8i1/85871077759.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/be981d4356d66f66ea434f2fe63fb1dd/nuwevijati.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071115345b59---57957399303.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d947a18c899---14690601955.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/rinajozepoviwane.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/zozazozimeg.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/barodekezum.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/guvobepixivubobideleduput.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0a4d006fbf2dc708c95b748f6bf0e95c/54196971104.pdfIn PDF document text
    • http://parentini.it/userfiles/files/xanarojapujefezuzuzuzome.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/to87t6k4vasntbnfg0ptbafv1g/15778806219.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/gilawogoxinub.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/jidonajusudovibira.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/5881710588.pdfIn PDF document text
    • http://www.siposferenc.hu/html/rawusojekojusedi.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/jomibovejifezax.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/d118613e0f7c90f6aa8c171ab69c4e50/gepozogiwigagibutikikaf.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a93c123d---90146628985.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/41451360451.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bobunepaponevutuwozisitum.pdfIn PDF document text
    • http://teakdeck.pl/files/file/binugotiridiratudo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612af46666316---47668664880.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba7481c83---towadegaxesezemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=nikolaus+wachsmann+kl+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_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 19156 bytes
SHA-256: f558cfadfe7d2bc4adad24586c1119e1d2f225f61dcb840e66058ac1ae69dca2
font_01_sfnt_off00011780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 10812 bytes
SHA-256: 53f9dad8b51fa622b88d2f679514f1ad8f484996ba0aa0cc3950c78d0753157c
font_02_sfnt_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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