Malicious PDF — malware analysis report

Static analysis result for SHA-256 9435e972848256a1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 16:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43ac80a8e11caf33065d804a23cedb6d SHA-1: 876aa43c9789a0194a05442d4e4c99965bd3daf3 SHA-256: 9435e972848256a1fdb2d78f9d6f972fe57a398451a166bf8f3e341913901e6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. Many of these links point to compromised websites, including WordPress upload directories, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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.
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=ver+sport+tv+online+no+android PDF link annotation
    • http://sintellect.ru/Repository/file/38727813843.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/36329455672.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/pexuseba.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/93400374839a0a1ac7732d2c20745047/metidesimok.pdfIn PDF document text
    • http://splogservice.ru/content/files/24183939660.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161408aba80451---15981335307.pdfIn PDF document text
    • https://sinarwaja.com/account/files/vifojeniwopamukuguzitafer.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/55700244918.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/41301366280.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1a294f6b---18272153965.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/2485145108.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/fagamevanifore.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/xodikopoposelepusirulo.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/nizuronazedopozozipodi.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/miwer.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/xejojogunapuselazuvel.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/miweduxifefoziv.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/medijadamexesakev.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/gizofufumimitelaruteso.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/20728418572.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/nixunitotiki.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/976812267.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/nanaziromuzawuvajesi.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210918185923_737025445.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/fovibipig.pdfIn PDF document text
    • http://aa-nusd.jp/89059834915.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_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 17324 bytes
SHA-256: 448f844c73aefbe1016e4c4bc42120c7fc93869274b9285bef15efc5c2092aca
font_01_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 10420 bytes
SHA-256: 926af938341edcf7e9e9ef05a78112c86b53ec453796c10b1f574a9e940c39c9

Open this report in the interactive analyzer, or submit your own file for analysis.