Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d2dd9947e8e188…

MALICIOUS

PDF

71.1 KB Created: 2021-10-04 03:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c19fece47182a70aad9a041e02cac48 SHA-1: 42fb0ab05bbf6e297e05bad1008e32baaf8bc6b4 SHA-256: d9d2dd9947e8e18829377acdd3011f1082779a1d389c0f14e758cf6e56e80159
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit user interaction to redirect them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://drafthe.ru/uplcv?utm_term=how+to+find+real+and+imaginary+zeros+of+a+polynomial+function PDF link annotation
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/vevofewazexutad.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/43652016963.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614db239a589b---31408606035.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd02b687d---9754430277.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/22759751227.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16143fd1827a00---zulivik.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/54395927128.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/64eb9ab3c01ddd51ca10adceebdcfb5e/pexezi.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/74292033670.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/sekuwag.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/xuresivapozalobubafager.pdfIn PDF document text
    • http://ilkemymm.com/image/files/rovokiwadekizimarisutu.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/rawuvig.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///xarujupabe.pdfIn PDF document text
    • http://www.polni.si/Images/files/jalijakapekodivodalajiwaf.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/73425240350.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/sidutopelo.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/goburogixaralaweguwu.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/53851898945.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/poliganekonugale.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/talupesagofi.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2c9154f4f---71104284624.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/nukowidomug.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615a010cd83d1---tigosarobaxira.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2d8406cc161fcfffb4dcca83d4423d7e/9504404109.pdfIn PDF document text
    • 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_off0000b4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F9 15056 bytes
SHA-256: 3a4790882f525f04f40f33a39b8c3a73699f6644b087d501126a50893074f96e
font_01_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 11316 bytes
SHA-256: b5d21e7b6c0bf7a284f1182e7ee129915637740b807977b443b96810ab2569bd

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