Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b3b41d8c3fe61b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 20:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 384ccd8fd521cb93c9198c959c4f8ccb SHA-1: 54f014c85835f3eba271f76fc1bc04bf3b9fd8ff SHA-256: e1b3b41d8c3fe61bee4ef1bef653bc83583676ed17cf034e7dc34884f031e874
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were directly extracted, the nature of the links suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8ff0c3233d17579a1506667e4eb2d621/litumade.pdf In PDF document text
    • https://underworldgear.com/upload/users/files/37163399984.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077973378708---jezakoka.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/92201888762.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/60087160830.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/43c301362e1bf4bb28975f4aae9289f5/gegalopebososes.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b924dcc6f6648ed6868ed5bebf7f76e9/41064811301.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/leparefanuwunutiwiturirox.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ee301b9df86---70798677743.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/32519965026.pdfIn PDF document text
    • http://poetryforthespirit.com/clients/872464/File/5616464514.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fekikubuka.pdfIn PDF document text
    • http://slsnn.ru/content/file/93361008865.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/14173656641.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/vikazota.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/lowumobuzelowaxusiluwoko.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/malapogorumeka.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/juwulewuxofevimonajutatiz.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607246b286fec---50649752174.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3a94458d4---fusurixukulugaroguwukotat.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/wujomewuvefuzetoxib.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/72624795063.pdfIn PDF document text
    • https://bem-sa.com/img/file/12539209147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pdfelement+ocr+pluginPDF 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_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 10732 bytes
SHA-256: 6a0b44d3fa8afcb7c5b3c5e53422cd3f148381120a1f3a95326c3c15beb737fa
font_01_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 19912 bytes
SHA-256: 48c7abe1be5c5a523ae75eab11dc569d0ca9a6cf24ab0eeac041dd89aff9a152
font_02_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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