Malicious PDF — malware analysis report

Static analysis result for SHA-256 813da29844c3253e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-17 23:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a7f7b9459f371d723769a2bcd5d0db1 SHA-1: 61d1353cc512542df1de7ddadd43ad3dbac704be SHA-256: 813da29844c3253e386c9d94f9f2bac0fad1b1c42b6ca97d2bd76bbd05f3bfdf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The PDF utilizes a link farm strategy, with numerous URLs pointing to potentially compromised or disposable hosting, likely intended to redirect users to phishing sites or download further malware. The presence of JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95480554833.pdf In PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/kebakabefosanopafinetuk.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/bujuboxudap.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/69441756717.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/71621806121.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/46950183118.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/91621479970.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5614369bd79e84aa154a04dfc4691fff/bujurebokolexipuzanu.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210914160736.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/95207908837.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/kamugenunimebalavunuke.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/nixogomajinanomegaf.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/xetapixe.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416409b4847---videmokofugipijonitekine.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210911082605323.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/33251214996.pdfIn PDF document text
    • http://chayka-svg.ru/files/69235299053.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/fejelozodafume.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/didanikunutasokusina.pdfIn PDF document text
    • https://path.mn/userfiles/files/94664452716.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/d87b48jp1qih5t8fk3vmlcdtt4/19246285077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hunting+simulator+2+download+androidPDF 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_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 10756 bytes
SHA-256: d89a5ec7dc45386711912201ac8de962ad5cc215bec6e4c2ac7a41236567200b
font_02_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 17068 bytes
SHA-256: 59d6c08b3aef61116c3127120432012181564970885ac2d2be381a70a97f123a