Malicious PDF — malware analysis report

Static analysis result for SHA-256 635ef50a3d99744f…

MALICIOUS

PDF

115.7 KB Created: 2021-09-01 13:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e50d7c3fae19f8119d41d4e21c337e17 SHA-1: be76a8317ec2b4d4b8521b9849ece75382b0fb29 SHA-256: 635ef50a3d99744f7636992a1eeb8977cd2ffcb7689a891475fd1feebbc3f6eb
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 as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of numerous embedded URLs, many hosted on compromised or potentially disposable domains, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/46728432772.pdf In PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd71a6259---83912941736.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/penewefatukem.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/47200717340.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119ffc79ede7---divij.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/7431925649.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/95617900331.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/88728575942.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb290a2048---85364645599.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/lomekowumax.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/dosujuxik.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e94517f0a53a7c0a9eab6b49f1dec109/xipojinakovifadiloka.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e69b6343be7025040e7651d514d8f0ef/71236381880.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfd9617c3c---82552787694.pdfIn PDF document text
    • http://packamate.com/userfiles/51983134280.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/lezuzejafuv.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/57116942071.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8162efb25794a02f895f5fc7680416f0/volunoga.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/11105041147.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/64629140533.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160818813a993b---72869765006.pdfIn PDF document text
    • http://texmet.pl/userimages/file/12656898745.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/16532723772.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e107202853---jimitufewobaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+adlerian+psychologyPDF 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_off00015d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17543 10900 bytes
SHA-256: 2d06024c3e470def53e6d886d9a56a3f43e6dcde51bc092358efae48ff0cb0ee
font_02_sfnt_off00018e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E3C 19172 bytes
SHA-256: 50d664c19d9d0742bc3178f22f90bc5590ca20379ab54cf1b645a1f96f857892

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