Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e97682b3ccad6f…

MALICIOUS

PDF

68.9 KB Created: 2021-09-04 21:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e02f02d2bc2e766d303e1483215cfd5 SHA-1: db0bb5d0f8bde38ab73c5fd8f3fde8daeaef862d SHA-256: 48e97682b3ccad6f783e920f7041f262a75000b5e65a70c26937c98895d3259c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or domains associated with link farms. Heuristics indicate these links are used to direct users to potentially malicious content, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=ejercicios+de+enlaces+ionicos+y+covalentes+pdf PDF link annotation
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/31740771400.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/wemifidaxewine.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b18924e2b41871472ae7e7bd7b828b0f/kibezobiwuredunesopaniteb.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/vegobatameputajupedumala.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/75262159472.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/jgdhgo6q3ufj1tpfg87dkfq9q7/gajotusulagojow.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/nekogepup.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/67736814497.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/xakade.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cf4827cb6---sujurafusid.pdfIn PDF document text
    • https://oliogalanis.com/file/bufavizigozodiwedanewa.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/17815059475.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/948add607f2c04c241791542523a2ffe/pedukedeked.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/duxevipila.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/jejipapunozuxap.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/vosedikobotomudowokubedav.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/82763480942.pdfIn PDF document text
    • http://rinsacars.com/files/others/8157388532.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160707e95466c9---ralorakos.pdfIn PDF document text
    • http://uci.ir/userfiles/file/74581671827.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/73056082890.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ae52f56acc48cb43ae06781283d9f0ab/21964493668.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_off0000b028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB028 14632 bytes
SHA-256: fb73d35d892eacc087c34c58d04ee0ed387df123507d43328daabbea55ca2a6e
font_01_sfnt_off0000d46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 10904 bytes
SHA-256: 30425b36524e5ece51099314c9ebeedaad18dd632d19fe3ceb0a3a04b11c58aa
font_02_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1