Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e0539b54c368ef…

MALICIOUS

PDF

54.4 KB Created: 2021-09-13 08:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 274dc39a92646f96aabbedbc6b57e58f SHA-1: 34889e78889c036fedf185ae866be867811e1f54 SHA-256: 98e0539b54c368efa3a47830a5fe98c39179e656ce9dad0e1bb0e96b3f1ea7bf
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links. The document body was unreadable, but the overall structure and heuristics point to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2924

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 http://www.fuchingrading.com/upload/file/xanema.pdf In PDF document text
    • http://noithatmfc.com/media/ftp/file/netulasezeje.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/48819193781.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/60090846909.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ij8c112eb4j7lbk7lhauh38d2t/nafufelixidagosibom.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/14145130666.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_13_59_10_3399.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/wekezisizojakuvotabafir.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/73075829597.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/60019914848.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/fuvureg.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/bojorovanadosinim.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/53461394923.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/xamodefirek.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/65202432951.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/dofoliruxukegekeragavutav.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/irbdb9knm65nj9v3fafh3505r0/tawexuxuralixobiragomi.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/jafijetafozokokizobi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rpavirpgivrelu295ut3rdo532/54508058960.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/14597069705.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/davedunibubu.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/xevedunevepekefabed.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/73795731678.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/30544701325.pdfIn PDF document text
    • http://carbonelite.ru/file/65854597557.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/baxufuvamaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=android+gelen+aramay%C4%B1+sesli+s%C3%B6ylemePDF link annotation

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