Malicious PDF — malware analysis report

Static analysis result for SHA-256 381d15f4de1f727a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 19:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8d82855f624e229c1fd998b90482539 SHA-1: e7af9ea8ce7fbc5d9a4af7894661a3a35f352447 SHA-256: 381d15f4de1f727aa9381758f0374be644c52d3f3153167d727178992d6ec680
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute further malicious content. Multiple heuristics indicate the PDF is part of a link farm designed to host or redirect to malicious files, with several URLs pointing to compromised CMS uploads or disposable hosting. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://catamma.ru/uplcv?utm_term=project+supervision+pdf
    • http://assistance.uz/images/shared/file/5893605839.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3990478f4c---52706888320.pdf
    • http://bukhatirhomes.com/userfiles/file/56511438702.pdf
    • http://bilmatbasim.com/userfiles/file/37117120563.pdf
    • http://adimhukuk.com/resimler/files/fabigojasot.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/53b0c284e0563edd1581b3dc909742c9/zigusemidotesabixi.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b1988ea1---sibavugarojazopatusomevoj.pdf
    • http://asustainable.com/global/file/sefapufukeraxu.pdf
    • http://to-kajihan.net/js/upload/files/jojasuv.pdf
    • http://congtydaihai.com/upload/files/guzivixidi.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b05877814ba---seforid.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9139adf3d---minujijubixobojeru.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/51859115755.pdf
    • http://alpha-cp.com/userfiles/file/gitolar.pdf
    • http://planetamama.ru/files/file/31634047132.pdf
    • https://cyberbirddog.com/userfiles/files/kilanabamisaxuxudumowajos.pdf
    • http://tktravel.shop/FileData/ckfinder/files/20210606_ADD600FBCEEAAA6E.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/13121389744.pdf
    • http://www.urbanwaterways.info/files/55840637353.pdf
    • http://acevina.com/webroot/img/files/39244272743.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161179edc52287---85093103839.pdf
    • https://takarasushimn.com/userfiles/files/xuzulivapasuwaze.pdf
    • http://driver-jazda.pl/upload/file/39795785858.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3f9c4924---nebonokeledapekuxumare.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d443.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 16792 bytes
font_01_sfnt_off0000ec55.bin
43e07869714250b940b61153b55bea43ad5802b4220073c1b730197dc64def5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 16304 bytes
font_02_sfnt_off000115ff.bin
7d0ad546b7812a3c80ce08fff90fe4c6d5a1dbeca77a6565b703e2dcca40240b
pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 10700 bytes