Malicious PDF — malware analysis report

Static analysis result for SHA-256 11233a9574bfd1c3…

MALICIOUS

PDF

85.7 KB Created: 2021-07-29 18:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0c9077b49fcc9e946b73bdcc00fb8337 SHA-1: 42556b3addee37dbe5644ab3457f9771f72fa952 SHA-256: 11233a9574bfd1c3dc87a44dc6f7ba0448ed6c1f4be305c9d75c88b40a0f9027
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of these links and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=how+to+make+an+agenda+for+a+business+meeting PDF link annotation
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ed215dd1---37264889596.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p040q9g6habpejot07polqnh33/57055283223.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/k7v1cla6ag4j0l6uhr595ahll2/sewamuxuzelanevinudugez.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210710_121647.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/0367e94698d82cb49b442c096acd1063/81999888395.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/38492915961.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/14973744902.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/eba73ed815c2bd4af862e493fe5b44b2/sasibutijekare.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/8fb12bfa58aca535e9937bb4321b22d2/nakiratoxixef.pdfIn PDF document text
    • http://beateromer.com/bilder/file/winiwefiripuzoduxup.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/taxugilezedu.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/60715822924.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e1181387---7204059890.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/rumitemebuwuvapir.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/kidanuditagegotal.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4557645e2---kerutine.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e0fca94da---tugofarilareja.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/xidagare.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/nelejijima.pdfIn PDF document text
    • https://robertbah.si/files/file/60935205576.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c60f624ab805d3f073b7aa86b0e6dc99/50083516656.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160746ba2aba30---vawulo.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/92021243289.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/ridutizimatuluzizixak.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/20230382512.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_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 11060 bytes
SHA-256: de97ddbd2c7ea6f708f8a52fa6775fa0746f20e4d5c96eebecfe8013a551985b
font_02_sfnt_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 16576 bytes
SHA-256: 8d0c3459f583f3fa56e6cf7421bf68cfbb187d147e829614d736622a8064a048

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