Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6c92c9fc461faf…

MALICIOUS

PDF

83.8 KB Created: 2021-08-31 06:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: b78217a9bd12565bffe2003d7e36d822 SHA-1: ea4341963782f9a71e89845ea3b9f514ec6e747a SHA-256: 4e6c92c9fc461faf5bc713e7f34cdebecf219d149092b39773f8ad26ff35d802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://adgroup.co/userfiles/file/87772748586.pdf In PDF document text
    • https://askisan.com/upload/ckfinder/files/40041012595.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/lupabiji.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/xelajirinenedesexi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f2966972---47493780646.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecfeae1605---zixomakojon.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df390a52c7---rejakumiwub.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad370f0576---regaxaxukinuto.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac131050b9d---zugipilaxovoxub.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/12462467997.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/40459212503.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a6c4c23a13083ca4be6a7a544325eb91/guxumevivemi.pdfIn PDF document text
    • http://jljemc.com/upload/files/13826792594.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947cc1ca739---64579743739.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/41259235474.pdfIn PDF document text
    • http://bjjiffy.com/upload/6819447001.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210719_205733.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/97dmbc7rs4p3g6ud4umdeibku5/12257288870.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/wixujazowebusa.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/22417269329.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vonit.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd7d9d34f3---nobejotimotuko.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/44665084207.pdfIn PDF document text
    • https://cityface.cz/res/file/kesoropomasuwitigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=comma+after+furthermorePDF 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_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 17820 bytes
SHA-256: 7e921b410e41ca4ef16a334bb97aab7751341364515d9f6ce39768041b590477
font_01_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 10200 bytes
SHA-256: 92b3c21179c49440d6374c676862e9bcab9b8bc6027b962b4817c581ebf7b20c

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