Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6d55390c5f9b68…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 14:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6919c80ca304865545b890fbb213a45 SHA-1: ba41597118b888f26c256ad3a6813357820bbf82 SHA-256: cf6d55390c5f9b684cfe7066e64e69dd150519fe53ec85f9cac97c5c1ffd7ac2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://onlinepravenconsultant.com/uploads/wysiwyg/files/51883707894.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2cfb2be293fc15c3df4d67a219f6dbf5/xorojaranedebit.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/23455351027.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/19763355808.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/55046231095.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//42435099998.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109938cf03ab---35400892614.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/09a1c566bbb478bbab39cc71d2dfc804/sutemaseji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d74aea7ef---wofijozolivibeb.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dkbaqjp9ki4npal43rqvb9r697/54885628267.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/texulowaripovofef.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/tudagibajulubewavij.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/96408057983.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/wegekisi.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/24740187086.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/xenibegejibobilusotudoni.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/95913548815.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16100832c1d36e---38864403916.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1610000a59b59e---74756700687.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210829_132730.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/35c33f8146e08f16749cbe998905a86f/jaxolalosixepis.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/1g0n0b91tr5r5sn3bir1nm2cm3/linabawudo.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/wixeluvijolofar.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/tubumeraveguvukoku.pdfIn PDF document text
    • http://guchenes.com/d/files/nujanuditefulobil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=wallpaper+catalogue+pdf+downloadPDF 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_off0000e25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 10712 bytes
SHA-256: 2fda246b0fe893111834c0902b1479cb87d2916601c79fef41e2c715ba9e1ad0
font_02_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 17144 bytes
SHA-256: 3acbcb93de38a41c532537e6587e3bcc9001e1dda79ba7b7cfd876372caa52f5

Open this report in the interactive analyzer, or submit your own file for analysis.