Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ce99b5cc5ac5be…

MALICIOUS

PDF

90.1 KB Created: 2021-09-03 23:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ec9e2124fd11db44c2b3aa2be0870bb SHA-1: 05cd43c0d784d59e7173d52c4d7e6483cdbd28cb SHA-256: b7ce99b5cc5ac5be8a4cc1074d0b371f36eb5684f097698533bdaa29f2872f51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the URLs and the PDF heuristics suggest it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=critical+race+theory+an+introduction+second+edition+pdf PDF link annotation
    • http://gnatowski.pl/attachments/file/xofaginuvatuwubo.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/15072733782.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/29186162655.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/65389232616.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/madematozu.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/282047046436.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/6693989162.pdfIn PDF document text
    • http://debden.org/userfiles/file/folenorosorexuxesadatex.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/zogetut.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/41cee0004ba35a1fc7526953e2288c83/93865061635.pdfIn PDF document text
    • http://aurora-c.jp/files/files/13499626699.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/puvadomal.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/aa4d30ca978f5a3ecda668d07696b72b/tetebeparakebuvor.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/15237205623.pdfIn PDF document text
    • https://inks.bg/userfiles/file/56972949158.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a6dc51a04---tedozudopelajadonikejel.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///63241106756.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/6014712589.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a84cb1ec63d---80509100450.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/67fa1cba9b041c45f099200e3c6e6cad/64140505080.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9f9ceb63e37d707947ee9eba7436b972/16683981653.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/sawipogatagak.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_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 18552 bytes
SHA-256: 8430c419c526e4d85a7d3fa9b1f34f8d1a0190969fc24feb72ea0769bfd72ad3
font_01_sfnt_off000128e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E4 10960 bytes
SHA-256: 6d35d297898df57e265268183492cf18d210b4fa7647c79f6fefc64e4dbb653b
font_02_sfnt_off00014252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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