Malicious PDF — malware analysis report

Static analysis result for SHA-256 a727188d223c01d5…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 08:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf0cde55a44aab15157155e0baa59da3 SHA-1: 719a542ab78dc7f8f33c92da688630ca0a288643 SHA-256: a727188d223c01d500064d9b2a7850cf2ce14458b1dd30b7a95a6b1fba387029
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=naruto+x+hinata PDF link annotation
    • https://thingstodobahrain.net/ckfinder/userfiles/files/28995317631.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/muvonilu.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/roxatimupivurugedeponizav.pdfIn PDF document text
    • https://n-tlg.com/files/file/pamix.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/xexamojitokugajewasimojir.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/sonevatuvu.pdfIn PDF document text
    • https://yasacompany.com/upload/files/zuvibovagetedimaboware.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161380f1c01cf2---29935131174.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/jogemiwaz.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/99748619450.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109140546342325.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/90df6a2f8cafbc62685fd7ef9488cba2/xifanepodixamezoti.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/daxoniseviketanod.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/16924070092.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/pojobewujobare.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631441706284433795.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6b06fcaf---wevagejema.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/30568418228.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/32467482852.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/dumikubap.pdfIn PDF document text
    • http://plncse.hu/php_data/file/jefenupafon.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/musipofuratozituvufufamo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/88e0fc89dda789865fe0697c4407dcbb/lokekuzajoxuko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 10040 bytes
SHA-256: e3e1f8619c59d28fb16b3fd455a7ee6bcea26a29a393193c57465f34b86648c5
font_01_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 19020 bytes
SHA-256: bff551ce09f443fda6ff66e35ca31263bd43fbc962707c3e7ef239eab65ca94c

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