Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a085e399a2cf92e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-09 19:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 64488364efd5c04d8e3cb7a797fe4475 SHA-1: 9126d532eb654494eb9b309c03d1eca4de0c8676 SHA-256: 6a085e399a2cf92ec13994483cf417934c122d9a8be569cfe38520b57efbabc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains flagged as compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of link farm techniques and UTM parameters suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/50175167710.pdf In PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/71960725087.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/jedosiwizudawiwefo.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/paniki.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/pogamabixigexuz.pdfIn PDF document text
    • http://mlead.net/images/e/file/gerijubomoruginigim.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d95eeaa90---jowutidufabojaxikataji.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d61fde3155a9518dc40ba8c1a8a1f83/30181156440.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/83104183665.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/kesovegisenatogeb.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/39607388087.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210902011316.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/nagafa.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210906_7DC9C67FCE1EA5A6.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/munudetikigon.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/rubutofaxe.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/nobipitiwimilonamatofu.pdfIn PDF document text
    • http://teresachild.com/upload/files/28366457485.pdfIn PDF document text
    • https://baptistfriends.org/media/vewuloso.pdfIn PDF document text
    • http://jljemc.com/upload/files/8743565170.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/86578151506.pdfIn PDF document text
    • http://status.cz/UserFiles/File/xinasatojikoxakevopojomuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pubg+mobile+lite+200+mbPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e340513d0c829402d72b1001647ed574/tadijigidopubeg.pdfIn PDF document text
    • 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_off0000b2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AE 10400 bytes
SHA-256: 915f5a4a2dd02d30079f7c3388468f82581a68d6e6d61dbbf00d73158199a7cd
font_01_sfnt_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 16912 bytes
SHA-256: 1527f5de54e9f9cce0b776f8e60c49f6a068de323323902c251af52a2346d1c2