Malicious PDF — malware analysis report

Static analysis result for SHA-256 249d99bdfb41ba74…

MALICIOUS

PDF

78.0 KB Created: 2021-08-27 20:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9d42d309f3e0cfac2a2a184260208e7 SHA-1: 98b0b5519d1ad2de5f6797e7841f5aaa55b44dcc SHA-256: 249d99bdfb41ba74753782498c7b59a154d2ee9fd2bd9e47021688def4cc69f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and disposable hosting domains, likely for SEO manipulation or phishing. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://deauville.ru/files/file/82467406349.pdf In PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/jcrnraqp8g2rlbi0mr2ve7ghcs/toduveludi.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/lesoxozekanibaxoromopiwe.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/fepewubadutikiguzesid.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/worexomimajuzetoxinupis.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/98815003687.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3ec42b91d9bb27da147cbcf4eb9c646b/ranilowebi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f71e5822b---46404446471.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c45211c4d53---xigofokit.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/jitilerutivonora.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/vodaxutudiwalofi.pdfIn PDF document text
    • http://rld-carbon.ru/file/38277709693.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43035d505a---sebuv.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/kiraberejot.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/13728543972.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/duzuvelivisa.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/00di708qqvq08gbfi94eu3qk9s/jesedezirizadito.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/90875788498.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161079b985b800---wilezuwugejagalaf.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/666ba8d792b01301c980bc93f0860917/68687851803.pdfIn PDF document text
    • https://asi-filter.pl/files/file/zuxiweb.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/sapataleroka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=equipment+for+diagnostic+radiography+pdfPDF 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_off0000cbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDD 17044 bytes
SHA-256: eed74d6e282dd3430a22ff3e80cda892c8357d46bed71e4f194dc037b9a4cbd9
font_01_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 11364 bytes
SHA-256: 753238f6b723d6423179c6306a3de71ab680b5f46edfa82776eb3a1fe60b52c4
font_02_sfnt_off00011284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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