Malicious PDF — malware analysis report

Static analysis result for SHA-256 90edcb784818c789…

MALICIOUS

PDF

41.7 KB Created: 2021-09-27 05:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d57ec0174b975e59440b43cd2ff4876f SHA-1: 054666b4a1b9292920456f0ef7773ad4a2b113ba SHA-256: 90edcb784818c7897156ba235015e98feb70decff74c033b01f27f922d366e1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous distinct hosts with a single link each, often with UTM parameters, which is common in phishing and SEO poisoning attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8695

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://infrive.ru/uplcv?utm_term=how+to+check+my+phone+was+hacked PDF link annotation
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/83959397731.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b64c6b899b---63552763983.pdfIn PDF document text
    • http://seamacros.com/upload/file/xuroxowusovefoxupax.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8eksd2avmb1svt8gnlcihncpf4/tufidekaxadexeze.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/5815833268.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/pibezu.pdfIn PDF document text
    • http://abnicum.ru/files/file/nugit.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/ratifesakikekikelinidu.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/sunumujitus.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7bb39a164---pibivor.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16148a0f0022d7---65367598673.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ijala.pdfIn PDF document text
    • https://anfauglir.com/images/file/21026637666.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xokurob.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/81703527126.pdfIn PDF document text
    • https://angkagenap.com/contents/files/67072946480.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/20208308250.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/33604296857.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/selebalamurofitefapudawus.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/44277227451.pdfIn PDF document text

Open this report in the interactive analyzer, or submit your own file for analysis.