Malicious PDF — malware analysis report

Static analysis result for SHA-256 de07adec19f987f2…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 12:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70614a8da022f2fd70a7c4ecd7be2442 SHA-1: 93ab8f924d37a393f97cc2469ad2a46ca883bf69 SHA-256: de07adec19f987f2c7427481602e70984a9db8c29c12112a23d0a98e91c89f2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://laborke.ru/uplcv?utm_term=fast+5+gomovies PDF link annotation
    • https://geloracinta.com/contents/files/jipexelubimefozoxafo.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/37973233752.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/14dad767fb774114ca5a9fdc41de2695/solowatukarujufedukil.pdfIn PDF document text
    • https://grandegroup.net/files/givuropefuledugogureju.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/nilurevigu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93b8dfe16---45030515562.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/8571554934.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/5877273946.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/kojemipoxiguzevirigukok.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/61436550975.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/sajewagolukak.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/52942003649.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/loduxidojodavu.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/vudakazuvupup.pdfIn PDF document text
    • https://km2804.com/ckupload/files/mujumanufugelabu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161410f55dacfe---lalexejalekikurevos.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/telixovez.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5bd8c85a4---84176882285.pdfIn PDF document text
    • http://falerisztika.hu/tmp/3810808618.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/47461238055.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/98468602713.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/fizewavadakimakifupegofag.pdfIn PDF document text
    • http://palami.by/images/file/dagesisuleludituwikaw.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_off0000d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 10376 bytes
SHA-256: 2d656b31d9bff50af35015534f8bf86e6da3cfb16703b2b76bbd2582bcab9fd6
font_02_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 17688 bytes
SHA-256: 81ff68d06276151c5c41959f9bf921f0d69d7b8b23ef7c73e0a744a34400a9bc