Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2c56c76d88be49…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 07:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 835843bdf6dde5f9e7a000fc34241a81 SHA-1: 7be5490a0f0d8f85466849d0ff351371c274a252 SHA-256: de2c56c76d88be490313be165290556b3a5a0948f647031dc4a45484c0b83933
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to distribute harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crysiq.ru/uplcv?utm_term=define+communication+skills+pdf PDF link annotation
    • https://www.casestilistas.es//ckfinder/userfiles/files/24419160649.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/07fb5ec9cc12470374e4ed14e5494ec4/5618559528.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/31662307363.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607146d0c0e90---toxozemesuxigemomobim.pdfIn PDF document text
    • https://majubesar.com/contents//files/gobifilo.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/p6185g0omfe05jk4ojmrkls406/34479347919.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/52537065542.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/34849683659.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/45241769070.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/4686687781ced6068ea66fd94c6b796c/vadabudogejosanola.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210622232408.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/79103617053.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/225281e019a90c165a002617fc0c5d11/tasotutarajowedivub.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/tafazepoxiwifosabujag.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cebf6ec884---49315868362.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db80990cb19---14723081380.pdfIn PDF document text
    • https://grandegroup.net/files/nixuloda.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/86533705576.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/66730579988.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/f6c901ad238d0640b20e031c2a76b44e/59268499247.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/xaloxabuges.pdfIn PDF document text
    • http://devison-matras.com/upload/file/41091940729.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_off0000d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 16392 bytes
SHA-256: 646b4a55a33eced27b3a03f1c4216901477425235326d14cd1848be3c85685a0
font_01_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 10876 bytes
SHA-256: 521c3fc89615db4f536609ff5efa0d5cdc1f6c72b041434d4f7f7a02c169ba20

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