Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3c19dd71d3caac…

MALICIOUS

PDF

80.8 KB Created: 2021-06-30 08:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9aec95438707a26c001664fc79db8097 SHA-1: ed3919bb9d3dd6478bc8b756d922501673d6c1fd SHA-256: 7f3c19dd71d3caace8ae0a714e7485d5980ab313f1d457761e742417a206b68c
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique for executing downloaded payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=php+pdo+insert
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cbfec330d---luxigamube.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8003642f3b61924f54be78b24109f06f/nujakuna.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddc1d6ccd5---80857867004.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ede92230515d85690aba6f0a7455113c/jobuwovilebo.pdf
    • http://santamariamikado.com/uploads/files/jimanageresiwemexari.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/joohd0mjtt4hmsb66j756n7dbn/gadejofixinodedovexap.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/39b6983d7cdcb892340586596ffd8255/lofobasuk.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/3c3e8ijaf12lfb5l32il42gtr9/30103549951.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c34df699d2---32749538657.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f72e7446b---ziretinaxu.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210528093641.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a262a65eb0bcd3e56f06468b42a85a51/39854319922.pdf
    • http://www.chatanakonci.cz/userfiles/file/90110828078.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dba0ae74b---25840295694.pdf
    • https://amrapalispot.com/userfiles/file/40820194220.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f0123401---napifadidajakeponogivi.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/99d77b2b3f80f8b88cb352ada30e75e9/gizezezaso.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/5iu2e5il6t88nvf3ufiejuu8i6/dujesalakiwekokowazo.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c582cbc99d2---48241905480.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869005c1e15---nofaleve.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/db1362ea8852228ce6856bc713aa66e4/jigiken.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/14212261602.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/8388a3b92d2579fe6b2d185910595b9c/lupigofugojezovanoruk.pdf
    • https://ahreco.com/uploads/news_file/58846973931.pdf
    • http://interface-referencement.com/userfiles/file/luzofurotupodulemede.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d762.bin
9c106d4c6e053891011b0e006d3340399d55ba90426e5e0b9f1cba876f4cec00
pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 10280 bytes
font_01_sfnt_off0000ee6e.bin
5bfa7fd487de9135a2f28e3bdfeb9f42d4f5e36f521bfe46ea6a4deaf8c6864c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 18008 bytes
font_02_sfnt_off00011df7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 16792 bytes