Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6635e4da3e241c…

MALICIOUS

PDF

81.7 KB Created: 2021-08-26 03:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: aa453df78288a05f74d152215456c650 SHA-1: ee4f2d5447d08b9ce8d047b880a474be4b43cc45 SHA-256: 8f6635e4da3e241ce2fc6de6b7f615c8521da3ac57fde38fa29281fdcd5125ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate the document functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting. This suggests an attempt to direct users to malicious content, likely phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f337041109---43564426156.pdf In PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/wipititoxebafusubabej.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/xuvunijuwojumagogivebaduf.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea51aa603---febomunalovijikerabo.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/89248692860.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/81978477565.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/mudubomevarex.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/lisobenafa.pdfIn PDF document text
    • https://chp-travel.ir/data/file/fesudulibufipotob.pdfIn PDF document text
    • https://xistenze.com/files/files/49766622056.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/meritone.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607747de9f565---17527993730.pdfIn PDF document text
    • https://lasanisports.com/files/58168492362.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2f84678kvmv240fj651s65i4b0/kitesanadoremen.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/rupovowajizekumu.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/24780409985.pdfIn PDF document text
    • http://nenorm.com/files/files/bizivavawuvifepatojewa.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a596e2ec757---17720030994.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/mixebaxako.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/42123712230.pdfIn PDF document text
    • http://caf-ljubljana.si/docs/2874811456.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/e80r911gs0g7f07ltb4m2t2q5q/34887713769.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/domozalijuloxet.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/guxilupanogabanuxageb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dew+diligence+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 18256 bytes
SHA-256: 3a9bbceefe098b6f961c7a66418101e0ddb05181f904cadd1a38b26d5cb70756
font_01_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001221c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221C 10312 bytes
SHA-256: 283f6a716caa5d1c800bb577f28fd5a13827d29a5a81d385534140c41b930182

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