Malicious PDF — malware analysis report

Static analysis result for SHA-256 06832ee41929ee4e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 13:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 7b68ba8cf7b9c92001e795a8b8b5781b SHA-1: 7bb3a5a1bafe95583cfefe2fe96f05f5a19eecc0 SHA-256: 06832ee41929ee4e8646f4bb13d3ebe8ac563a48eccd99100fdd19559160d71e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pixomot.ru/uplcv?utm_term=manual+de+usuario+sap+business+one+9.2 PDF link annotation
    • http://caratow.nl/userfiles/file/49227726632.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/kugujatim.pdfIn PDF document text
    • https://cubic.is/userfiles/file/83060506077.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/xiwexujizuxifa.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/36039954085.pdfIn PDF document text
    • https://efnnma.org/files/file/sudawubopepigudewapubi.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608400249429c---57383894992.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/6734569717.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/174e22ea80744b4edac7798a4edbe757/14021747611.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/68742085392.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/4594927166.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608527ae2f2e3---zijaluk.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9e54507cd806ddf8efa6dcce0bb6a5be/19073310940.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/14229877158.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/rodifapivuguzujavudoxofo.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/vupuk.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/91781026849.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ffb0343bdb52c3d711f65483046cb3a3/wikekifukig.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/gorobir.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/973b46.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/61077896766.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/lurutebilisetopupijofiwow.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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 10876 bytes
SHA-256: 48b68485e1ee9cd485af64793ee9fa9f0bbbe4dda6357ab9d4b14424c760d2bb
font_01_sfnt_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 17552 bytes
SHA-256: 400e1b5c5685ddbfaae81fd70589ddafa5475225c362e8addb4dd6376230d345

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