Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0866ac14b304ae…

MALICIOUS

PDF

81.6 KB Created: 2021-10-01 21:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9f742583ab559af635dbd31568d37d8 SHA-1: a4da6b2412b1805a0801ba49a476b581761df4b7 SHA-256: 1b0866ac14b304ae3db71bd1d9d86b1604ca8366cc2294c75c2ee83055f07a16
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure and a 'browser extension/update' lure strongly indicates a social engineering attempt to trick the user into downloading a malicious payload. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ketchas.ru/uplcv?utm_term=wtyczki+firefox+android PDF link annotation
    • http://foxgraphics.paulsfashion.in/files/88601577851.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613accb6d5dd2---68848090944.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/18405899885.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/sarasedawexajoniroguluti.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/zetixilerumudijoxopi.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/tozimiwifawalobunomol.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/19344148030.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/filowimalagaxaj.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/88538777790.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3eb4c9ab9311bd324b950c13a8462c73/gefewefide.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/85918771491.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/niputebof.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/84658051858.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/mosaxifakaboluvoverim.pdfIn PDF document text
    • https://esvigo.com/upload/files/pibubipedov.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161517173747cc---15498765964.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/pukabex.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614eae41ab98c---5649804902.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45604350310.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/letagegasigujegazozuvevo.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/66167892018.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/79843782473.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/84628617284.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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 17068 bytes
SHA-256: 3342ebd7e36d52a4e2a4d80da0d16440c4086bf53f2ae4cbf7a915af9896814e
font_01_sfnt_off00010865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10865 10616 bytes
SHA-256: 590b1ac553fd791cf6262ca6493dbbc37cc633383f0e0b16e2534a185b1e7b2d
font_02_sfnt_off000120e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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