Malicious PDF — malware analysis report

Static analysis result for SHA-256 643980415ed788fb…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 06:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f00b643a56bd86879ba5e236e392826 SHA-1: 18dd2638528b97d6b4686fa47c78c56af44950c0 SHA-256: 643980415ed788fb08e538d2beb6541813c0f5480fc0e2da34eb29dc653811e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous links to compromised websites, including a link farm hosted on disposable domains and links pointing to compromised WordPress upload storage. These elements suggest the PDF is used to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ita.kru.ac.th/ckfinder/userfiles/files/71811946944.pdf In PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/b3d677b3e9966e7ed9b103dc69e3ec68/xefotetuxesebewasiduze.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/58fc4627830191080702e08f36307bee/16546806350.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ojnbv497bejgifp3o72hj60gup/gulasidu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d6976061df5158d81dda128aa787d51f/98035269592.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160f3332ac9975---31593783251.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc61173ab1f---238181677.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fesujawegapemixazixuso.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/tebemexufosa.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/2fted02j24ju928fpjfefns8qu/16551091713.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608768bc69225---nagiwakobusa.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/kuloleta.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/5797542342.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/76202034701.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/21822771257.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb1f4abcf---gofatuxalati.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714fc3712b4---maxejezefezefeserew.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/42943408374.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607817224b65e---70219261794.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e9141199d---45985977885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=maths+addition+worksheets+for+class+2+pdfPDF 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_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 11008 bytes
SHA-256: 8f4ffd40dc8b94059d536065d0cdd59946896f7e4b342a62d4454784ea9fadca
font_02_sfnt_off00010e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E61 17652 bytes
SHA-256: 25e175e64804e51705d1b50d991857386f50010fe80def220cfc19c0ea8f8f65

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