Malicious PDF — malware analysis report

Static analysis result for SHA-256 af239069e9873483…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 11:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f82fc37278ef6cf57f81a1855a4ffd6b SHA-1: 615f0339348f66fa20077c348ade3780a00ff964 SHA-256: af239069e9873483a90d50e3fbd2ffdaabadb8a4fad7a959950dcfb083c63a97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting sites, a common tactic for distributing malware or conducting phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple unknown URLs strongly suggest this malicious intent. Although no scripts were directly extracted, the PDF structure and link farm indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/bijawoduwilita.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1884791a5---57717467285.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/31635830159.pdfIn PDF document text
    • https://toocapen.com/files/wapibazeworo.pdfIn PDF document text
    • https://rajaunited.com/contents/files/nexitetez.pdfIn PDF document text
    • https://strechybenesov.cz/content/96095266877.pdfIn PDF document text
    • http://cpils.com/userfiles/file/puzuvajixefaki.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/wafevuz.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/54640224791.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/83523956575.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/181176252d027ff3e69e7edef81570bc/12855478.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b76c987c8f2---kakusov.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/dutuxoxuvijefaxagaduwab.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/31664296361.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/sii6u6lekrjo5in1ig2qp0c53q/77888808132.pdfIn PDF document text
    • http://eccdc.org/application/webroot/userfiles/file/12643149494.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/o363put9t4sp4sqmeo593dll3l/41689205996.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/87015539472.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b585be158ce9656330073b060b2f746a/22271994847.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/60cddddde159e28e61ed2c5e99a0df2c/pisunevetubasajexasu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090a6e4dc85d---pujurabapibidamomerinatex.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b2c8ca6b---gigamesalimolopegosiwix.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864098761e1---69866887812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=quiz+about+horses+with+answersPDF 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_off0000c47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 10604 bytes
SHA-256: c6af3403b70f5bc4e37bd58cbc96dd9a3901aeb75477ea875e50bf5ddf240df6
font_02_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 17500 bytes
SHA-256: 8e997a03cdb8d2bd890e801af2b0d958527b88dcb7aaa208344bdaee5c1836a1

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