Malicious PDF — malware analysis report

Static analysis result for SHA-256 def3bf5b8ce3e0e3…

MALICIOUS

PDF

79.1 KB Created: 2021-06-11 08:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cc76589215881af057bd46f90a95205e SHA-1: 29ac6fd6d4804e78ef366fef1d10f76183d312fb SHA-256: def3bf5b8ce3e0e38e7830828916cc4867121f05e94bc7bbc279809e0baa2060
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised or disposable domains, designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords like 'Shooter games apk' and 'wkhtmltopdf', indicating a lure to download potentially malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7866

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=shooter+games+apk PDF link annotation
    • http://daiichilogistics.com/uploads/news_file/50414332975.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/21061117928.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/d4e444d2oe6q9ofbgf1ildc67a/94582096809.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3080e479a---zidepikuzozalet.pdfIn PDF document text
    • https://sambelteri.com/contents//files/xetadafiwowibame.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f123f3fb86---zukut.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/372c87283062d15cf2ee2454dd874144/tewelefenifiji.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/dudajaxapupin.pdfIn PDF document text
    • http://ekotronic.eu/files/file/kavedomibasi.pdfIn PDF document text
    • https://parc-hotel.info/file/9178375649.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607771b0ef7da---90784055412.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/52711993360.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/jivafi.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5c0068f5---43025002234.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/kudetaripupubukaw.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a079846f0c0---35815156667.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/q6caa74pqloatglehb9jibu3cn/xamamalefawixejuza.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081f11ed1618---kabanojipafiwokumumotoru.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afeffaa71c3---80011449344.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7E 5368 bytes
SHA-256: 42e6699342c1f843e82bcbcfd927f653a83fb26581418c24b3c587ac7d61e422

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