Malicious PDF — malware analysis report

Static analysis result for SHA-256 83286b262a8a666e…

MALICIOUS

PDF

64.0 KB Created: 2021-09-20 12:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c112de1f7e7ed4cb40539aba64e8633b SHA-1: 1d1309bbee71042a148c8088d85c7ba1b44899fe SHA-256: 83286b262a8a666ea1c00b1c49c5bb8b68597c83107e0c1384625bc26977fccd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs and link farms suggest a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7390

Heuristics 5

  • 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
  • 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=can+i+send+an+app+from+one+phone+to+another PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140f49b534f1---39879654039.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210906_064648.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614657a524c71---bakowamav.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/20076044401.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161415fda40b0d---77389411434.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/22305876254.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/fovidaj.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d1d4dc730995d0a4926c4135194eccf2/rijidakatibakigiperuveba.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/tapefa.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/58356585050.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/46332200586.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425fade1507---gibedutomunofokugu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/bf9762f85a67b80c731217dc437e610c/6085394094.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/titanu.pdfIn PDF document text
    • https://kuepancong.com/contents/files/21536438794.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/36d9168c734606b50de492ce66f2bf67/10982294188.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/44677623367.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/zikuxi.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/63078878184.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/16038290538.pdfIn PDF document text
    • http://3q1p.com/upload/file/210920041155997752lrzhgidnu6dz.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/65dec5b22babc77ab06cb8ed8c21ecec/92862420615.pdfIn PDF document text

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