Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca40102cb60c92f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 00:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bb23a55f7e3a68d53d27e917b13e021c SHA-1: 1ed95ea1725ff36c18c5b346a9bc2eeda88c74ed SHA-256: 3ca40102cb60c92fe65676fe0a4340426c747d91d4e599d06e4dc39af267d919
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, directing users to multiple compromised or disposable hosting sites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=nightmares+come+at+night+1970+watch+full+movie+free', are likely used to deliver phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4357

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://coretry.ru/uplcv?utm_term=nightmares+come+at+night+1970+watch+full+movie+free PDF link annotation
    • http://sfipl.in/userfiles/file/42368129965.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/webopelesovob.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613494019dcf5---55356271731.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/51955142407.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/ganoboxe.pdfIn PDF document text
    • http://osayit.com/images/file/weribo.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/notuxajex.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/48578883608.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210913050425.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/lusezisuzeturapimuduwuzi.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/64909680609.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/11314256665.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/gegilikofakamuvalokemaxox.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/5fcfd4a11613532498bc19f52dc2447e.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210906/file/16309331145415.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/nonimiwawupejujekugeromub.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/pikama.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/purelibukiviwunef.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/wekolakazolusitofojot.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/56258157761.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/91060709483.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/82797931825.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c107efc5---texuwavin.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/bowekomugikuja.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ce32b78280704eab56d584d536435895/47774815528.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161308d48e63e1---86816078620.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/6837720946.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_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 11404 bytes
SHA-256: 467328ea90a8f0bb309a5cff0bb80e65a538a356273b5a487f236b10f954f93f

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