Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efe253f987e544b…

MALICIOUS

PDF

76.2 KB Created: 2021-08-11 12:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70aee2cc239ddc3ffde49771c89e2623 SHA-1: 3c7b26b8105e731528ab49d8f55f17d8d88e940b SHA-256: 1efe253f987e544b7f0ba0c424ecfe5944103df38c78f0040ce0c35aacb19d40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload directories and disposable hosting sites. The primary URL, https://nomylo.ru/uplcv, is likely used to redirect users to malicious content. The PDF structure and embedded links suggest an attempt to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/uplcv?utm_term=chura+liya+hai+tumne+remix+song+free+download PDF link annotation
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovnivrq44ju2p2omm305mf3une/36254557073.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/pjjacqp41v879crnfna5q82fd8/kenomanexejodalixejikije.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/pumupudusagapezelefowajim.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/11109541349.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/73957579275.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/18096745829.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609700d9479b0---85447430640.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/54534110851.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/fejorirageletagavexu.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/14538740807.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160877e7a2b652---bifazudebasanibigumap.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/83850570235.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/xeduxi.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/95493045251.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ip54bgt6l9dpvjs4qfl5mrs7o2/guvebilireto.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/fibawifesuler.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/5bb743263b9e17041f28acfaf4838c15/57183830614.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/1242be1ae729e37675359274fb8ca5a7/rikulir.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/limojadegujavobunavuvezi.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/fupexepefaleb.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b3ceb79c4---61953461134.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c47ea29778---84948071181.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_off0000c4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A2 11232 bytes
SHA-256: a5d619df13f1fa88bdd636f11880541cc189b2e61973bd92a37162d802230b94
font_01_sfnt_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 16792 bytes
SHA-256: 51614cf7834a59e1e8e25f4335d4faa8ed83a166fc7e727649fd9917bd0ceca4

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