Malicious PDF — malware analysis report

Static analysis result for SHA-256 649db63e30e69a27…

MALICIOUS

PDF

109.2 KB Created: 2021-06-27 22:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0803215b23325d0894d135c724dc16d5 SHA-1: f4c6913fb8f2017ddc172ecac12141a0d79c281c SHA-256: 649db63e30e69a2777e2b5a39d720242f9c9801b2c3d3d77c49ffff376df0316
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://inwebjor.ru/uplcv?utm_term=annotations+to+finnegans+wake+pdf PDF link annotation
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ced0c2104e7cfef659aabfe843735019/visitapomamukuno.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa6ca3897d---pibutisuxovasurosuxa.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/75686395889.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a79580574---41791448479.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/4628267039.pdfIn PDF document text
    • http://secretinvitation.net/images/files/nuzofozelubuwumuvilujodo.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/31804684837.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7f273f5b---jirevunanetolakuxuset.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/28244457606.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d22ed0235d---15909681001.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/pebikekivedutixawo.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c624b1a0f12a842940ffa83f41fcbe7a/webapadujurenidalefasidu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0ab784e6d---59503543886.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609beeff4fff7---45005356867.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a5a8e0cc---33176618659.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/f5ofi7k77tqfosq2dv50jqibfq/rekororovewivekel.pdfIn PDF document text
    • http://holzbau-napetschnig.at/77788273709.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160878c1e9b113---73220278541.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7e82ec86e17f4e53f691de0cce429d46/34712962088.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/31b8ec14d3bf4ca1b7d229725b5fc0f5/8192133554.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17404e4be7---buzuwogosamorulerinax.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/zalunos.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cee2bcf99ef8cfc9c4b43f421d1f0b23/92369498523.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_off0001435c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435C 10688 bytes
SHA-256: 9de29b83538fb9718265f25fff2d537651d0b3a424787af644fe5791a7f0a311
font_01_sfnt_off00015bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BF1 20172 bytes
SHA-256: 970ff4ee2d3af234646e9cf29edb5a4d7607ee7895364c7b89235778a8938aae
font_02_sfnt_off00018f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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