Malicious PDF — malware analysis report

Static analysis result for SHA-256 179273847cfa6300…

MALICIOUS

PDF

97.2 KB Created: 2021-09-23 06:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffaf7d1f4fc8cc9f29d9c9ef2a6e1a5c SHA-1: 0873a62fd0990f382384c382d56c00ade4ec08f3 SHA-256: 179273847cfa6300a3ea860f82174a62cc0080616a940de9b7b0bd5e725d2818
204 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and multiple external links, some of which point to compromised WordPress sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious browser extensions or updates. The embedded JavaScript likely facilitates this by executing malicious code or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • 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://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161429b87eda1c---butuwobepege.pdf In PDF document text
    • https://southafricapools.com/contents/files/lenud.pdfIn PDF document text
    • http://itena.si/uporabnik/file/26584446144.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/59873543354.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/nosevefomobipenuxuviga.pdfIn PDF document text
    • http://riversedgefm.com/files/file/zonivexevafexuwafelo.pdfIn PDF document text
    • http://deltools.com/userfiles/file/nerabubotagupip.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/23199700062.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/tewawiwadoba.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e6a9df88521933b981e02d706694c62e/sikipexuludebul.pdfIn PDF document text
    • https://nistd.in/userfiles/file/35242542789.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/1935148078.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090618361933003.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/46808170599.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/15259572234.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219161047557074.pdfIn PDF document text
    • http://malifer.hu/upload/file/kilage.pdfIn PDF document text
    • http://byecook.com/ckupload/files/17935474842.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/66582787737.pdfIn PDF document text
    • http://builderall.info/userfiles/file/29295717694.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ob8akhr5rum0blnq41turuoiq7/11456887550.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614319361249f---19278085814.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/tesig.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210918171335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=differentes+versions+androidPDF 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_off0001184f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 18076 bytes
SHA-256: 8177869dc5d14401c36b70f14081aeedb90037293876fb5c4d22618a135961b1
font_01_sfnt_off00014754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14754 10368 bytes
SHA-256: 571b03ca594873f28c0467853a9cc2bd74d6ebb59031da0e924728ed339ac1bf
font_02_sfnt_off00015eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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