Malicious PDF — malware analysis report

Static analysis result for SHA-256 c521bfc334c4d4be…

MALICIOUS

PDF

86.2 KB Created: 2021-07-04 20:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4201d24bcfb5b31dc90c937c52866619 SHA-1: 3a5abc2479aafef09432c6e1f5ee265c50fe9561 SHA-256: c521bfc334c4d4be0c6e8b0e55416a2e7b8805c36c12517ab3857970c2bbd280
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. The embedded URLs, such as 'https://drafthe.ru/uplcv?utm_term=public+broadcasting+news', are likely used to redirect users to malicious content or phishing pages.

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://drafthe.ru/uplcv?utm_term=public+broadcasting+news PDF link annotation
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/47852453616.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8180de471ef3018b276fd42f069918fb/37665235251.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b83ec8817e8---8755089402.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e416b280c8a0fd5a1649b5a6d0a5a94b/16566202425.pdfIn PDF document text
    • https://cristalensi.com/public/File/85914337192.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210630_125058.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16093dbc66d621---keruxikesilevivife.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79f517257b9f636abd6aa6f2dd43cd4a/senikatezekifofifez.pdfIn PDF document text
    • http://beateromer.com/bilder/file/50635294962.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160909fdfc73b0---vovinawosufa.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/12100545815.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/32106931079.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/damudakitupulozog.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/ronekomig.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/90711ff7282c8bba6caed8e5bd8d44a0/27788029699.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/minovuwanapu.pdfIn PDF document text
    • http://beiks.info/public/file/73200213670.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105040359417092.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089e0e527b1d---98743599610.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/36366930817.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160903d8cec5d0---kinobi.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/svm8c5g872kk1a47jfnlai6j46/7378864326.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_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 10872 bytes
SHA-256: 9cf6152ae2cbd57052df5f099293581b38ddeddd5b0d3bf52460b17c550758f4
font_01_sfnt_off0001033d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033D 17908 bytes
SHA-256: 95b39c9b5e79e26088bcddd09aa43f7c0a65c13e7690b719a4b28597920f8649
font_02_sfnt_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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