Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a78dd6a1197267…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 07:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 943a848a5e144145d75527d5570a60b1 SHA-1: 9e50acf78c4754b4373f4a99b8d3ec96c96aed79 SHA-256: 79a78dd6a1197267b3ffa27e651d24b6a8cdc3846e5579e3cbfc2cfbea9351b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, with many external URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ozanetiket.com/TasarimAcarnet/serhali/upload/files/82849611943.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161390d5381b13---fodepomerusalijobazijadi.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/jepabum.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/fimetisofa.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/61341690091.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a8a83103---64896804766.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/84968141547.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/fufuvegafamadibujuza.pdfIn PDF document text
    • https://invision.buzyhub.com/files/26459450037.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/zajomesujejekuvajaruniz.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/83758192477.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/titoratekebowu.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/doxezavuzogagulirulebele.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/rumemowomojomitupomopekup.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/fawitovelesadovakumiz.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/78372814899.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/50162732432.pdfIn PDF document text
    • http://arucax.am/user_images/file/bexigoworitago.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/jowitaxuvoxixubemudizesud.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161350c310098e---82330988826.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/pigamukodojew.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/64115657254.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161338e28d3ded---95619583883.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/sujofafetemimijoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pilgrim%27s+progress+vanity+fair+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_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 17720 bytes
SHA-256: dc87c67d7d6f45d5df214a726cce7fcfe20e63af5a02a21d9864a5c6e6865a5c
font_01_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 11056 bytes
SHA-256: 146e4f49d06c64cb8d567a70473cce755441d8a920d9479645e6f8ad02c80b54
font_02_sfnt_off00012fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1