Malicious PDF — malware analysis report

Static analysis result for SHA-256 5813b3e1c3d9d576…

MALICIOUS

PDF

76.9 KB Created: 2021-09-08 21:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7abeb6ae0f3f2a888b21073c5920a546 SHA-1: c4b0372ee014ad6e2887e58e3f7919cb76ac3836 SHA-256: 5813b3e1c3d9d5763deed8f849bffd28ee96437e0fff317a9305f994f9dc37cc
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to host malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser update or extension, a common social engineering tactic. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://carnow.jp/js/upload/files/gomuw.pdf In PDF document text
    • https://stiglic.sk/userfiles/file/joxexorufot.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132835e34d65---18599036849.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/27503709577.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/fulixuv.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/bagazitibo.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/dovivoxemasu.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/40955161762.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/riguwewozilenolilaloxep.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/lebedaboduzib.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/59827018825.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/kijatawux.pdfIn PDF document text
    • https://motoralbini.it/files/file/rivigopivubesefoni.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/88921471046.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613427012bda5---1601796908.pdfIn PDF document text
    • http://remobudostol.pl/pliki/dulazewip.pdfIn PDF document text
    • https://etadelloro.it/images/file/nowefoliwopa.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/zejopuruxop.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1ec09ed01a6e7bb3fdf76df3cbb9f8c9/gonibetelebimifupenawik.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/jesux.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210901171801.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/nazisa.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/31879085508.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/8502771918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=anti+ads+apkPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 10060 bytes
SHA-256: 8fd428c4c3ef17f02e64d13a9c0f141312315c2e6fbdb6b1a751d742cd90b9b2
font_02_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 17264 bytes
SHA-256: a61de270d642560f0d213bb424833c581d49f22e4ece3562bbcae75cd408b559

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