Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d806b80597f1fe0…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 15:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4f78eb7e0b56c6b8efa80a292ae131e1 SHA-1: 46d8ba6cefe52e234dbe731ca89a21221f6d7ca9 SHA-256: 4d806b80597f1fe0bb0d03d0b567435fc5677ef45b1af0e09f0260f65093c64d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics identified the PDF as a link farm pointing to compromised CMS upload storage, suggesting it's used to redirect users to malicious sites. The embedded URLs, such as http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16090d79b7a853---fejowawomap.pdf, are key indicators of this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607091d1174ce---jutasakavemezetijikivike.pdf In PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/43872573919.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c5083b5ed---sesusakepuf.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/a6c363c58c4105df85d8d24ce9645307/53229996917.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e49176c10ff---wuzilofixuladodikojipeda.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/kegoziniduduvepexolo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16090d79b7a853---fejowawomap.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/4050040652.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202162017919.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/jokeliwivizilusof.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/94488099746.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7812c907b980d0f67345ed5fbbdb906e/nuxuxapomapavugo.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/pagun.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0deea5f2e970a8ecf79999dc9e495762/58317114972.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210810_FBDF82F5B5F1216A.pdfIn PDF document text
    • http://pololanna.com/user_img/files/kakidukonu.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/wikozorajidovizofiki.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/df2b48e5dfd52b537d3f0c2c42c3594b/85656032216.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/fc2991eb9d8c51b86954cb2a0f7c3d42/79784956135.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/2ddc38fcbc4aec3dac8ef9b87558f8ab/49007820846.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/kuxiru.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161234270f0ac4---femufuke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pioneer+9250+manualPDF 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_off0000d85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 20680 bytes
SHA-256: f1e6b556e410de7a3304dc181083fd9e8eed67c79d2028578a6e15318d464b10
font_01_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001267d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267D 10648 bytes
SHA-256: 4e34f208049c9d928b62d194b0a6cf86c0a30a00aa1949ca4a7ec976596b620d

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