Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5f1b3fec08e332…

MALICIOUS

PDF

89.1 KB Created: 2021-09-18 05:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44d2fb158ac0b9767f0d1ce3647da725 SHA-1: 098bb232e9973cfbdb603ad6df8bf35d594f8a59 SHA-256: ed5f1b3fec08e3329bfd9cbf0c2df992e395c552a97dad1389a43471a0eec316
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised or disposable hosting. The PDF likely exploits vulnerabilities or uses social engineering to redirect users to malicious sites, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings. The embedded JavaScript is likely used to facilitate the redirection or exploit.

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.eurosecurimed.com/ckfinder/userfiles/files/99150357731.pdf In PDF document text
    • https://ecoolteh.eu/galeria/file/wenapogabij.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/todovixipilosaposisur.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/zopojososujiz.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/76201712732.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/17689037801.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/66342975938.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/nokabexironadukuwatitox.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/gozobonorabitofod.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161378d14f2afc---loloxajukesudopemelove.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/fogolakarajutojakimepi.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/1028486320.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/28189025f1ddc68fe173b63a98e4d268/4118746586.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/74529737641.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/zomonin.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/1569246835.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/507b8ccd40839dfdc23822e52bc7eb1d/76432323979.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/jazirujana.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/xikemozibejunolela.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142215d2face---sowug.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/nukamebumopaderosevebipa.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/58150864803.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161403c093a20d---74227511917.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/forabopoxet.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e9412cb24f61fb14ab3293a9ec7bcdbd/xolokox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+grunge+stylePDF 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_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 10472 bytes
SHA-256: e85bfedac8b7b929a7102f2926b5c012900657da1584722f1222bdc25bd64589
font_02_sfnt_off000124f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F3 19208 bytes
SHA-256: 3f9cc8e5b4e418b5f453f652f7942bb691b32b12e328e3846e82800a884ab1ab

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