Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba2d89a93f7500a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 13:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6b8a0852ae2b4343621c7e72266ef2b SHA-1: f5a021e05706e915256912141c4bdb90e7173e75 SHA-256: dba2d89a93f7500a1ca5899c2429912665cfda655706de4f920198d83e85a02c
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to external URLs, some of which are hosted on compromised WordPress sites. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161469e720612b---10124041022.pdf In PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/bb413dfdef802aadd89b5da2ca05c7ef/7768561597.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/zoxomuwozanakarupasesivu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614781ca84b65---jofanajesobalidijiwano.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/32112564211.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/nivesivegozurakomutotij.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/bujegezivimisi.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/37687544942.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/wumasinemabebon.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/xufakurite.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/zekovezujama.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/56616642546.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145b52236bd6---50486674981.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147514ebfb81---budulelivefabejebejulif.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/56956547477.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/30954598272.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/lukonomejazosu.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/13585480188.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/83586320703.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/fakolabakegewugijemogo.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/sonigidi.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/98073298840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=3d+sex+villa+for+androidPDF 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_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 16764 bytes
SHA-256: 1d9878c2b7d111cd9d3bd9daa74e824ffa99ad52b1749bc6b040e53cf8121d39
font_01_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 10492 bytes
SHA-256: c8259fd183c6f54550cddb317b7d8ace1d48b0c11484dc7bea32b9cafadbeea8
font_02_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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