Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eed11aa200698d6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 15:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81a40f31c5982e542a74c070286842c7 SHA-1: 1a5a9c950bfededd6f345cc77a7ce7798f63b438 SHA-256: 8eed11aa200698d629a4ff91eab96530594c9660c7703df4b188277c92fa82d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f06484ddfb---musolojugotesixepulesi.pdf In PDF document text
    • http://everestlodgelukla.com/userfiles/file/sunesatutilazemagisedaz.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079d97786ca4---resisavapidafebofadisoz.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/benomoxetixunodiva.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/deguvutidub.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acebb4cc7c7---81872389923.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/8kr14us42u278anljt99g814v1/rexanoresoxirutit.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c86ff10beb---37948195513.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/47261165295.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/db160ebeae6ced748bd1a197624215bf/vojetutiribojarezudax.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/068cbf17ed22b8ac711f3f9d0aab7211/80164365081.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/vagowifipalapusirijon.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1e2b0f89433a107a43372b7aca5708f3/26270765956.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/59420871484.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/91250093575.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607761d80768c---71444186688.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1289dd19e---jidejulopepe.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/jatabe.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/19900274097.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/wodixefagakaduresetinawe.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/92338413361.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/lnk8k0r13jr8knev83h16t6m66/95810884415.pdfIn PDF document text
    • http://www.xn--12cfj6cf4edkfa3b0bnvcc0ewa8fd0a7nth.com/ckfinder/userfiles/files/62612612952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=non+calculator+reverse+percentages+worksheetPDF 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_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 10880 bytes
SHA-256: 9815b162cf1c3fec2f956ffc05753d19db9b0f42fd3bd7cd456ca3421b7b7a5e
font_01_sfnt_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 17076 bytes
SHA-256: d4ec7d678f0d7ef54ee5fb97ecefd26adfd605ee4d7e6ea0bdab2214815f956b
font_02_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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