Malicious PDF — malware analysis report

Static analysis result for SHA-256 14eca3f4d043dee3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 00:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55bc37864c03223dbefb759e502df9e3 SHA-1: 55bb9c76a915e0c02190ca019f579403d793a4ef SHA-256: 14eca3f4d043dee3ada1b5e51abeaf7be33a772c00829a8238a0e4514d638784
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress upload storage. These links are presented as a link farm, likely intended to trick users into downloading a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613711b58ca71---xiwozajudasagoladaledir.pdf In PDF document text
    • http://abwingsde.com/uploads/files/zonefogipoxuba.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/18416785014.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/9724558090.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/8999721145.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/21862309097.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/gozozuja.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/89557482444.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/vevazaxew.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/ridajofibidixazujo.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/juwikugoliz.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e41c886d9---72653163754.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/484dd75a776f315a0016586bbf48cb0e/41717965339.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/pofowoxugofixosodibag.pdfIn PDF document text
    • https://austarpharma.com/upload/files/natirikupowegetuluzu.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/narinikax.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/legokokexesakir.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/fibusawababiwenolos.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/durixuvekux.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/1650bacf1b00d50db5c2c45ba7ef6d24/64198617848.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/85550364439.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/bijuwipomigasadiwipefova.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/99739498456.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/17691715901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=five+nights+at+freddy%27s+vr+downloadPDF 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_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 18168 bytes
SHA-256: 0a02598d6330ca407b065d3dfbdce105df127562f9838de539d47d2fdb476e03
font_01_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 10912 bytes
SHA-256: 622a4fddebe1ecc78402ae157d15bb0d5e3fe60e18a5846269de794f9846a3fc
font_02_sfnt_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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