Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d2d61b1522b798…

MALICIOUS

PDF

70.0 KB Created: 2021-09-18 08:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2856b017d85064fd97b720d2027b915 SHA-1: d559116b9b239527f387d1ea33a79dedf38f9d71 SHA-256: 72d2d61b1522b7984bce9137f1799353e72c8e2c131cccc31dd83de68b680949
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting other PDF files. This suggests the document is part of a link farm designed to lure users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161411a7565e17---pesageri.pdf In PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///tajesakuwuzuzesebuk.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd01368b1---menoxinaxunedakaxemu.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/nuvuzuzufuvelumuzovafef.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/xeduvexujaridenujuki.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/purezifi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b2b0efa35---jimetexiledafitulex.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/49602635583.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/fuvoxibikenipukerizus.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/zibezevibe.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/13160568465.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/60c7bcbdf8636e5f9b26d2713477d013/39032007291.pdfIn PDF document text
    • https://onlinendttraining.com/files/81156215109.pdfIn PDF document text
    • http://x-mobio.com/upload/files/9107381038.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/73065766000.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/55833610647.pdfIn PDF document text
    • https://ijpdua.com/contents/files/zawirokusog.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161405050136a7---91578451958.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80645903175.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/34064597689.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/62183511724.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/koperurekovox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ettercap+android+apk+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_off0000b3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A4 10500 bytes
SHA-256: 2583aa8197587b214d62ffaba31e6ef01e42d75e6e1d6a0dafed549219009afa
font_01_sfnt_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 15276 bytes
SHA-256: b8c94d6ecc5baa0a9a2fb2e8dc84a4020f4bf07050322088c2797df2e97e6085
font_02_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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