Malicious PDF — malware analysis report

Static analysis result for SHA-256 081ec5e0edf6a265…

MALICIOUS

PDF

89.8 KB Created: 2021-08-14 17:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bef65df0175a3a678b158d461868bdd3 SHA-1: 5569909ec176646c788cb45e64c318e61a547e1d SHA-256: 081ec5e0edf6a26530452a2672c7588d9c7bafb501532f851bd6314d70e51bcc
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://rowanmkt.com/Uploads/ckfinder/userfiles/files/6437349973.pdf In PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/366a8dd5d5801ea023c124f962c0d3b4/81127235229.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b15374ea123---96578013842.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/stvlm3fcb41t7acj5brsm5hhgk/zomarawaluki.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/kuxoladanat.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081b318b68f8---gosepuzidamit.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cf062598d87cafed779d6654b8851cb8/zejabinazewile.pdfIn PDF document text
    • http://shshalloffame.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/13288845031.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c2b2e8a5d---98492419780.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ee57bf56be08401b8104b44225d21846/pegadojineri.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/4kfh6irbqp9b2ac4g8kt33ncpi/94730685030.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021626116568038.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/36584013468.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/dalusuzotosuv.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/rilenineti.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/95208183157.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/98431134683.pdfIn PDF document text
    • http://sro52.ru/uploads/files/tudisoxosalutukejigev.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbda0e67d29---13267305855.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792de8c5bc6---xaxizepakixokevifezuf.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/58751847680.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/betisufuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ciencias+formales+y+factuales+definicionPDF 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_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 10884 bytes
SHA-256: cff241bed87bffeab38bf76144d1bc54b81de2ae9b08fb31fdc8eb0b5f1a93f3
font_02_sfnt_off00012c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C18 17316 bytes
SHA-256: 1558ae304f9d75b8eb3c929d003fb48f89932a5e9fe8107a71fb085c937c6942

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