Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35d6f5f6ae92b7d…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 01:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9082d65d6033747e0aaaaff164855e8a SHA-1: 4c5982a6ca4758f3548ba991a6d0d3a618ef32a8 SHA-256: a35d6f5f6ae92b7d210a87a9360e6f590149ffe02378454e1976e87d689bff7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute malicious content or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095878f05fdf---97714444975.pdf In PDF document text
    • https://cytairtool.com/test/userfiles/file/20210629_6071e.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/u5aubh4fgkngtgvc7fq3gsmehr/97128388911.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/moxujowipofopijij.pdfIn PDF document text
    • http://halaljones.com/uploads/files/5452732432.pdfIn PDF document text
    • http://sivam.pl/files/file/53908273824.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c85e66ba62b---motunexipid.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/18390789141.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a8909430e---peragadowaxonuren.pdfIn PDF document text
    • https://goodline.by/userfiles/file/87511247006.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/70878755691.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/nafiw.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbe7dd70fd---revuzire.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/dojugixu.pdfIn PDF document text
    • http://irths.com/upload_files/files/zuxototowalu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad849bb87---wotiguv.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161184aa90fc72---22481095609.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/37550834349.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/jadalojejawokogemelutogo.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/vugisefiturovaxudujinosus.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d42f8c073f---66285441279.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160863472684cd---fujusedewipizo.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/hlad4nip8g8mq3k167dl98djaa/28353389638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+are+failing+grades+in+middle+schoolPDF 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_off0000bbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF7 10916 bytes
SHA-256: 536d6200585d8fa2f5fce6d2b381b9922361e107202ac388b683ebcf913be028
font_01_sfnt_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 14756 bytes
SHA-256: 6548aef7c06ba1218553323a5191673ea2dd4ac6210d1afd025d1747c50bb589
font_02_sfnt_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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