Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b40cc4e09c6c37…

MALICIOUS

PDF

85.4 KB Created: 2021-09-06 22:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f9eae14302e5d5380e7feed0e91641b6 SHA-1: 50f4c8e78dff3b5c23ff9fba766477d99110b723 SHA-256: 90b40cc4e09c6c37c88d4dc28701a26ac04af8a76843b9ccb6a3ad3f1217b3a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fc64bf79a---76690063644.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160baccca01fdc---80647344236.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607098b403ba0---zenibexofi.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbf9337643---22353283383.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/lavuvipene.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/janojesoz.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/cruhfaqp505sh47o6hraikpugd/labezavukava.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/patopezibuzoxisadal.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/49786d5333ee91313ee800e0850c3016/21535593395.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/8775192036.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/sedonojasuzivekikon.pdfIn PDF document text
    • https://beaszemin.com/files/10104573833.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/worexopubekokuf.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/rageziku.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/37889817303.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f546ab946e9d7124c082771680798a14/23386835557.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52dceb1080---tudopipus.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/sugiwurubumomevumo.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/rlhtj7gouf0d2hpif6t0p03ne0/40282726370.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/numoj.pdfIn PDF document text
    • http://wych123.com/upload/files/44295660660.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/39286526863.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/texudiwupuv.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/af0b6c685542c6807a5fe109f6337304/47680548679.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/79305419079.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/li52edisn480kcl2q340aoa809/wuxufikile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=firman+generator+3550+manualPDF 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_off0000e656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE656 10788 bytes
SHA-256: 0b890b5ba4f388a8a0e102b9993bf8a70733b0c8ce2276865c4348a6c35975ba
font_01_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 18140 bytes
SHA-256: 71aee2f999a96969cd68800f5b079d891256ed5d48d8f4af11c431b0d17d1cc4
font_02_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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