Malicious PDF — malware analysis report

Static analysis result for SHA-256 362f25fe5c8daec8…

MALICIOUS

PDF

97.3 KB Created: 2021-08-12 22:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2212670c4134bb9c823d9fd48fbbb2a SHA-1: 9796693a5aff13faf7ec5d73e2ea8f722311f37a SHA-256: 362f25fe5c8daec8b05f5ad8f860954d421d9f2a3d0f486ea6a542b36d9deedc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a9f2132ac5772febb50951432ab192d7/daduleduvaromiduxozebi.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sgjqrq1gsu43cipn1dqrv9omj2/tunorulalubi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa0e56b0c2---naxegadadorafugad.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160841c82e7c58---82416145842.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071d240450af---bonoguxive.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/tuwowobekatefoxirate.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9c90127e8---61074502614.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/lcrtj5mncqbv54iar3d28m49gc/72063932596.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c0480f95---66627139642.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/32208170903.pdfIn PDF document text
    • https://silga.ca/userfiles/file/pizazazagemavazeri.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/dedagodibifavugorimunu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/72af2061d87618f451ae77401fe09175/junokodo.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/sipogadinutimemunoweroge.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/58715449183.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/657e7f9bf9f73935bf16d65841b1e2dc/83160510548.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/nidevelasad.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/mazebufivipofelil.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607506275a783---nesulepizuzisafar.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781c61d47e9---21366268316.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/wedotubitaxabepem.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/17623468161.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/9881822501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=student+exploration+longitudinal+waves+gizmo+answer+key+freePDF 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_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 11536 bytes
SHA-256: ec0482f64fe7d218913ef73f0eb3967ec94423a9c3aec2cc597500b911ddb253
font_01_sfnt_off00012ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA7 18308 bytes
SHA-256: fc3688c79e313bfcc839b3411ce0367bc059d550706030c31478ade7d0c063bf
font_02_sfnt_off00015f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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