Malicious PDF — malware analysis report

Static analysis result for SHA-256 9418f9a223de7699…

MALICIOUS

PDF

95.6 KB Created: 2021-09-06 04:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b4cfd8a881d056e4434caaa249d1ff5e SHA-1: f284ff5d727dfbae8041dfb5ae86b50cd4087c7c SHA-256: 9418f9a223de7699cec36b0fba2b5028b688bafdadb8de6a5be10635177a1bc3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of multiple external URIs and link farm characteristics indicates a deliberate effort to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c58d7ef82e36dc8b1c0b4f33ece8b685/fekisuva.pdf In PDF document text
    • http://jl-vacuum.com/upload/files/36825939945.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/63875039460.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/65829271882.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/44220510554.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34346b2f9c---xekupegavobolototaji.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160774a748d760---mikixajadewuwagusek.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/87767779958.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/somimig.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lomepebuxo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866687074d4---fasexojejodogi.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa536a5ba2---58363587776.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26e81da58e---vobadugupap.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e2b38e5f---18463755431.pdfIn PDF document text
    • http://hillandcunnreunion.com/clients/864369/File/74344332904.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210821212216.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/pumarumatujov.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/34344875897.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/55546207458.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c926b763---labimenogepilaworitivuw.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ffddd0bf62c03c3a92369322e7a85c93/dexenifuwibavag.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d8f19dd1c---59272204793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=free+worksheets+for+first+graders+in+reading+comprehensionPDF 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_off00011256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 17016 bytes
SHA-256: f6d395f3f9d57a2bc1df34648bde73d73ab2e15322087ec85aa0c3a584e30107
font_01_sfnt_off00013eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAE 11176 bytes
SHA-256: 9b9f1238e07493be00b2cb26f1e6e4435ef5257b3f1f033e962736c5c6757e35
font_02_sfnt_off00015884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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