Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4099fb6e0a3be81…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 04:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a10aec4ea75e43d2cd2cfce13138aae SHA-1: b69cc57f86e8b7f0d1a2e36503c9bb4480a50729 SHA-256: d4099fb6e0a3be81e19d7bcf80da3f368da7cc94bd336c4d3392a6e2eb30338d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The document also functions as a link farm, with numerous URLs pointing to PDF files hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded JavaScript indicates a potential for executing malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6611

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=come+inserire+una+pagina+pdf+in+un+documento+word PDF link annotation
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1649158d41---57928820106.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/wosafuxizufinamidixu.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/25116588949.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/11548128715.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/22140308311.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210806134631.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/lofileju.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/xuvir.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/93550930083.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/46526697734.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/36257253201.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/e728fe512100b7b1c35905953f542600/fimagosoz.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb5936b02---dapugokezopolimesule.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/d9ba086934c31de433713f6bf5f1dc57/61842399427.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/56181486971.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/oo5ucgdabsbr6fkr358nkhjmrg/19133643064.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/jufetoderonavufefelob.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd65c23b455---40784213346.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/ganora.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/34974417377.pdfIn PDF document text
    • https://service-panev.com/userfiles/92893952692.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/todukanupafomajonatup.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rvpvji0r8c4haicun117381tr5/wevewopafetebax.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/wavaxamavuw.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 11132 bytes
SHA-256: 0101e085e204c2252be95687af95ff54483fc56209ee5b5f94cba951d121ebf6

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