Malicious PDF — malware analysis report

Static analysis result for SHA-256 766b67336e89bd42…

MALICIOUS

PDF

103.4 KB Created: 2021-06-29 06:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a6fa26c9e548411ef8d059c105d4ac84 SHA-1: 04fa764013575fa02c9556538fddb53af11be23a SHA-256: 766b67336e89bd429d289fd0e96996e2f7561e52b422e7a07c46055949abd5b3
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URLs, some hosted on compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of a 'Browser extension / update installation lure' heuristic indicates the document's primary goal is to trick the user into downloading and installing malicious software or granting access to their system. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 9

  • 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.
  • 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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/508d68e1f18f003dd87df88bae437226/xosanaluxidikelug.pdf In PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/sojugiwefabixil.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/1470848af877460956c82a84b65a6775/demujajuxivadiboxo.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/bijasimolilosogudiw.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b00143b4eb3---97841496932.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/259d07ab6aca6629a67a786dc6808afe/mutowuvilusitibil.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5218441f---kimepuvasufafozusazonera.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/tumodasakakogo.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/8b49a65dfb57c493b023d5f452a57399/wubejukojozolutemule.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/nerazixujuxujoponuwom.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6c1123b8b192b348879c935caa9c3c8/bilojiduvu.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/simosavufejabixekulo.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/widuveba.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/18198717163.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/47700945140.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e606e5f15---9202662551.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3000e9312f87b36a424b65dd52eb47a1/rimaxaximipolifiloz.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/a6uemh38dpctp54c3co5u4p8q9/zidikizite.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4e1315a8f9b22586d1a0db7559229ad2/40179945698.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d1ee334e3---pemopunesifotal.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bddeb20e---91220034649.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/keterumigagekoko.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/bojiramoragizizeli.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b80521530---kewetosigetiguxevup.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6b360e20---filokipejok.pdfIn PDF document text
    • https://eztv.ag/search/%sIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=utorrent+search+providersPDF link annotation
    • https://rarbg.to/torrents.php?search=%sIn 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_off000132db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DB 10640 bytes
SHA-256: def861061edeb23250c7768985464cfc78ba7f59f11e6bada94d49c408df884a
font_01_sfnt_off00014b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B31 17252 bytes
SHA-256: 49d2f5c0efe11ac91934e33717ba7672f3695f101960d22f6a638f80445d625f
font_02_sfnt_off00017861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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