Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4e886d2ea86ea3…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 17:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d94ef6481aedd2581ed3cecc0eaa2d08 SHA-1: 4d9bfb9028e7eb8e5b865840572a759dad2f5d2a SHA-256: 9e4e886d2ea86ea3dc54f6d6b2e1d2a6531c7fee9f770ecde6d9a195f9799abe
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple external URLs, many of which point to compromised websites or disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension. The embedded JavaScript, while not fully detailed, likely facilitates this social engineering tactic by displaying the lure or initiating a download. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://drafthe.ru/uplcv?utm_term=truecaller+beta+apk PDF link annotation
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d97e3482a0---zozesigamewurubezugefum.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/15071110383.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/226b234244868e9b8ebb2de1e3446f20/jezuxuvu.pdfIn PDF document text
    • https://drlanda.hu/user/file/3985824437.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/xisivitamox.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614598cd29b9a---gelimila.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/xinorefeludev.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-11/20210911145131813574.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/buxeju.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/lewoxabulakulafadab.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/3605689060.pdfIn PDF document text
    • https://foulardfotografando.it/file/33925331715.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/piwogawologaguvo.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/54490473521.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/14961332823.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/lolofanuxira.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/hQDoqCjMBpV1.pdfIn PDF document text
    • http://lecostationery.com/files/file/zogewofenu.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/patewaki.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/50080981243.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/45214058108.pdfIn PDF document text
    • https://ip-pharma.net/data/files/liroto.pdfIn PDF document text
    • http://plncse.hu/php_data/file/22502023165.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/72923252094.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/keravugo.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_off0000b391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA8 10176 bytes
SHA-256: 62211e94e83ed10841f0aeedcd98107b30a0b0935d412dbaea6553e21be4403a
font_02_sfnt_off0000e263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 18036 bytes
SHA-256: 91f63660843bcc4b37389c9931994e4e6c5b187966ad9f00a6fcd5974a7f9b94

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