Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e8272766ef5a9a…

MALICIOUS

PDF

76.1 KB Created: 2021-07-30 10:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d9aada128f6257008ddb663f7048fdd SHA-1: 1fe4b7ba8a0b2d7e2685c867a47b786da9d8fa98 SHA-256: 23e8272766ef5a9add58ce321798aed34d53965e8d428bdd66da6bd460b45a6b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document likely instructs the user to copy and paste content into a command-line interface, a common tactic for executing malicious commands. This suggests the PDF is designed to trick users into downloading and running a secondary payload, aligning with a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://catamma.ru/uplcv?utm_term=what+is+cmd+in+bank PDF link annotation
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092fe437f32a---57736694087.pdfIn PDF document text
    • https://o-dance.com/upload/files/nomusonigusafusadu.pdfIn PDF document text
    • https://avvocatoboretti.it/file/vifaligetaveto.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5b95b9640---gubofokozigosiwedipek.pdfIn PDF document text
    • https://people11people.com/uploads/File/68821996352.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/0769cd7834a78694995a74c18b4e7552/33447171149.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/72221513589.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4961f6ee5aafe5d895a0fe84c231842b/75313307569.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21e0ba7e000e8a03ee4f00358f73cc68/18325281541.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/42934b9e582d036c090ba8a97071e3ea/79136071148.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b212ea26d0e---voxakafogapixigalaj.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/1b9465407a85f1f8171a8a6f568168bc/33723805833.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf6e70ea12---37803651320.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/53664529723.pdfIn PDF document text
    • http://101balkon.ru/upload/files/65292976742.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/46097900583.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/7255632381.pdfIn PDF document text
    • http://thepducphat.com/upload/files/xuvape.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a70a6b2d2481943a8a7ae7397b152f59/15241630536.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15206911021.pdfIn PDF document text
    • http://myphamasia.net/upload/files/gorafefuga.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609de10785b86---lopisonapubusivimubireji.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ca9ad884c---35039754205.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c99104607---59524264532.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/sasetixiwirozulapulito.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61c44432e9---37940022645.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/e26fec0f38f68cbe9c4799f5379d02d4/kexuvusamejuxevifa.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_off0000c74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 15800 bytes
SHA-256: ca37a55d85b67a416d86e74f523e846d3d6fdf239243fb37e9d3f0eab8a61f3a
font_02_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 10464 bytes
SHA-256: 0d76a658afff64e29ee1074093c223297a195b78f9941d35e86491ea919dd2b8

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