Malicious PDF — malware analysis report

Static analysis result for SHA-256 313367d504bd3327…

MALICIOUS

PDF

85.4 KB Created: 2021-09-07 21:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a98ba59aeac3737dd962b7e5c09e5604 SHA-1: e36f9af3a8e7f386bc5782448275a455b7b249cd SHA-256: 313367d504bd3327a596c00928d889a825a9ed1e5f240c7f0e7c9f0e5931f82d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, likely to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights its nature as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/738febe5b08bd449d59a6e6cc0cdc4df/44635494951.pdf In PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/99c7d6ce8e8befdb7c3152e1c311c140/dujutezolafikulixojej.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca5ea10cf0---11041133026.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/kavipidoxizerobewodumi.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/66466288337.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/27005222428.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/32353619761.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/20626936135.pdfIn PDF document text
    • https://ntc-container.com/upload/files/ramena.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/qub6rhfd6k8op65o42fj8bat49/wupug.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/21479872790.pdfIn PDF document text
    • https://fallsplat.se/file/fazajijiliz.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/93122740321.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16114b9208e7a7---11288181094.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/neligab.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/salijoval.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/61627117147.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/71146908674.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hb4d8g7460kfkuiq8aq9es4k63/jeben.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/puvosidozoxasajoxe.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/35697543572.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/99434555402.pdfIn PDF document text
    • https://kede.org/userfiles/file/38477109354.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=mimaki+jv33+maintenance+manualsPDF 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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 18832 bytes
SHA-256: a7167fb77879d41e0bd8948cc9da00315dc19994c15e41dd8fbee8e4f3e69db4
font_01_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2D 10724 bytes
SHA-256: c8100440f89fef4819c0d05ccf17b3c5a89e5e4d8e97834ec4abd6c3f4206508

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