Malicious PDF — malware analysis report

Static analysis result for SHA-256 6681b58fd36dc3c7…

MALICIOUS

PDF

86.6 KB Created: 2021-08-20 13:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d94f16a6529c1c69946f02ceeff4cea4 SHA-1: bdb540659735b77421838e676e042d192f7bda08 SHA-256: 6681b58fd36dc3c798582d8fc139e5a8d3128e05f1ee079b4a6eef7a09634ca1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external sites. No scripts were extracted, but the PDF structure and URL analysis point to a common tactic of using compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nnt52.ru/userfiles/file/lodoxaximarubulebuga.pdf In PDF document text
    • http://christschoolblr.in/userfiles/file/58863536414.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/5910543378.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/98228630992.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/fafowiwokikewelasovituja.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/28265523034.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070067873a01---37165191423.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/rivabuzekopipebojuzesofi.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/068bbcabb7c61cfd3f19ce3db424f25a/ladaburosijilamesasagefe.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/61064839361.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/jaxapoz.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160841392ab265---39453223063.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/ralifepoxakaba.pdfIn PDF document text
    • http://markone-tools.com/upload/files/nevinogeru.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffee809280---zupipola.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096430e53c7a---xigurijutowaminitaremepu.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e9101c79---91378694801.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098302450c75---tinesoni.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bcf41a234---85362704672.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16272499198933.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lesozusavaxudez.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/31224359452.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/80191156668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=different+types+of+anxiety+and+depression+medicationsPDF 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_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 10952 bytes
SHA-256: e8bf69657564682f3f69f110558f1b39ac6bf2ca7278840eda43ef513ef610db
font_01_sfnt_off0001072c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072C 16596 bytes
SHA-256: fce0426dd6236c1891dbc72d092ab8c31ffec0496a471bf4085b11b515a5eca0
font_02_sfnt_off0001326e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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