Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c75a07bc21d1e4c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 13:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 862eb596ee72422e07358e7f0a086681 SHA-1: 2ed1eb190ac7b30665a327c327bf157449a30262 SHA-256: 8c75a07bc21d1e4c16e7491c7f7a626cb6d832c906b019b0a515212052633997
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for malicious content. The presence of external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ketchas.ru/uplcv?utm_term=how+to+manually+sort+column+labels+in+pivot+table PDF link annotation
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e8d66009c0a50446ae3f6024e064ac0a/30129215275.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d11bd7311---58889774410.pdfIn PDF document text
    • http://allycatering.com/userfiles/lamino.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/80109487231.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16126cd82383c0---vajoxumarefimiresarede.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lnqo7dfqidc11o43vj1d4fof16/ruren.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/zuvafolagoxafozemutu.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/98180990785.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210805_005048.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/885e9fb021fcfd0d9f7cfeb366ab4512/24749923636.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/44269028869.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d69f459926def1f3734be82580992a86/42235269505.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36ec628948---fiweritip.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/butuvefumopavagemuxezusa.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/75861023052.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/fasakipatiduv.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd5655d089---xowiranaw.pdfIn PDF document text
    • http://altinay-law.com/images/file/gekidom.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1749751e302b7daae95c789b65e707d4/narabobimunifikikowej.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080dd7abb1e9---1621068505.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/fudema.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/18690981116.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/394aaa0dca59972175092a4d7fbe629f/94531769313.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/xapalitezijob.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_off0000d6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 17124 bytes
SHA-256: 4b7391fcc364d571298212930354c313d3fde0e5aae17f9d7c9a7bd7df49319d
font_02_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 11032 bytes
SHA-256: 14b536bc72c50882986a6e11cbd33bc263dfe79bc6e34d86d9a18c9a7f06cd1b

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