Malicious PDF — malware analysis report

Static analysis result for SHA-256 6564babe8756d408…

MALICIOUS

PDF

71.7 KB Created: 2021-09-06 10:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b732952b0ad5925f574ec361efa20de5 SHA-1: 03b9acac80850f0f50287284b304da0189f3dfdc SHA-256: 6564babe8756d408dcc1607ddf3c15f092e0a4bb2197d131f02ece65954c617b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the final malicious destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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://healingpawswisconsin.org/clients/a/a9/a991db820639e3552774ed9a746c1e3b/File/xesimixajogiwisoluto.pdf In PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/14821041997.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611892ddc9714---41843841801.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608301fc22018---42242570336.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/93662127126.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/2d636776d2e15f70955111dceac5b2f9/6338548665.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/sumivegemusedoxeri.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/fudelulotakubofanasalewo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/c0515fcf310bc86188dbfb31b131d30a/95564630023.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/gtfbqqd4akosdlp7vk98qar3v7/94554623391.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b6a0e5d48---sukubowurile.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9mnqha6vssjo16nb9o1qop7j3f/83374754553.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/647e2224c3511705e9a00d56dff9ec1f/mimepa.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/336bd256dc524597217f5c88bd5d20a6/mifaxetenawiwadogi.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0303823001625647677.pdfIn PDF document text
    • http://jorakaygame.com/ckfinder/userfiles/files/vetufi.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021051105281252231.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/tetilebiwejo.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3702d7bfb7---bobiturizebikanivuzisev.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0bb0cbed1---13974604680.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/wapibatogasuvos.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/benezewakimuzoduzitoluru.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087e172ca187---67634428805.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/jufipujofafapuxi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962ecbd8227---vevalo.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/976ee1d4b4dabdbfaf4e5c8aa9991a58/sufikamagax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=probability+and+nonprobability+sampling+methods+pdfPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 15064 bytes
SHA-256: 96a9dd1cdbafc824209968eb8adcb0e45f5eb3a35dc2be95d12f256e03b3fa7c
font_02_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 11200 bytes
SHA-256: 2a2f0e3330e247ce6c0f65fa2ecaa681bde957cffd4b9a3ffc87a3ca6d1315a2