Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4dd5b3837d96ba…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 08:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 67e1d7c8e760936ad105bd006759177a SHA-1: d564f2db300f3a84e5d892fd411401164780dacd SHA-256: bf4dd5b3837d96baf41b4ad8d439e8bd8b453d2c37439c943ee09ede8d896324
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Multiple heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites and potentially disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=tap+tap+store+apk PDF link annotation
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131567a6d6a1---36433747346.pdfIn PDF document text
    • http://capri.lt/userfiles/files/jiduvefadipusivagukoji.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/04e0bcc88e562905f7add198d74c8fc4/fugor.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/filobugabamofa.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/kijepusejupumikanid.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/96228460683.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/zorutomomekuw.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/12446771907.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/jofifojokogisox.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/53129776579.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/41b3221f17745f071678297941e95986/65676752857.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4cd42c370---99097839423.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/13923683086.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muwitelifen.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/najepuvojefojuvisaporezif.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/pumegenuwonore.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/kuwise.pdfIn PDF document text
    • https://best-label.com/upload/files/12333899978.pdfIn PDF document text
    • https://pellevah.com/upload/files/voparujiterolisujezow.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/87408855245.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/ruxawejisotamavodabugi.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/43902606901.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/19oa6m0d64tevn9b1pj8p9mf2g/11389816550.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/90703190160.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/4087521909.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/49778532130.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/58164931186.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_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 10056 bytes
SHA-256: 10ae4dd6c01e54569c722766aba05efd510b3f6f8ee29a7ce914ab51390d680b
font_01_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 20080 bytes
SHA-256: c65dc41a9a6d3dea92cc140cd0ee3a41832e95f3fec22f4a2a528ad3c945173a
font_02_sfnt_off000125f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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