Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfbf91667c7ec3eb…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 17:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4e31bfab98f3a8ba90eed450554015b SHA-1: 276d1fd48d91a72df26579afe17018f49b0f233c SHA-256: dfbf91667c7ec3eb083fe6e76e8378b2bf1b985563efe2479c5c94321f11c744
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious content. The presence of a 'browser extension/update installation lure' heuristic indicates a social engineering tactic to trick the user into downloading and executing a payload. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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://medvor.ru/uplcv?utm_term=area+and+perimeter+worksheets+pdf+with+answers PDF link annotation
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f432553fea---xumefaduzetis.pdfIn PDF document text
    • http://snsi.jp/image/news_file/35394806765.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614091febc55e---juxan.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/loviseda.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/nusogalokosilizo.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/turuvirekolakit.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/dagavexesofigakojulobarab.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a513d15fe8---55028082145.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wubekuzom.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/xukigodanebopuxuvugajike.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149b818840de---39523462190.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/kazile.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/11503645406.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/nopozawixi.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/38381953507.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614716b6f3c64---kafuturod.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142420d3e3bc---susutebifibidonimusip.pdfIn PDF document text
    • https://icbacademy.com/upload/files/voreronugonapuponuboxemo.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/56901106387.pdfIn PDF document text
    • http://airfa.it/userfiles/file/midibavopapular.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336518719bf---6589016853.pdfIn PDF document text
    • https://aildf.in/userfiles/file/99578354113.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_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 10876 bytes
SHA-256: 5701a9c2cc1c2f698cffb58e8d36dfadd8eb4f99bb2e24d4264a1756d6b5c58f
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 18164 bytes
SHA-256: 82b378580145b4e1a4b241da30145901c5b33ccab215572ba9d93dbc442f3c65

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