Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78d0e9394efca1d…

MALICIOUS

PDF

116.4 KB Created: 2021-09-06 13:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5d5b46981d57cf66311a831bc9d786f SHA-1: c5201eb02f5b97bf3e83aedec5421302e36663e1 SHA-256: c78d0e9394efca1d0351edba68b2ff3c75ffb7b44d34bb2cc22a70ea64ed1a18
196 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. 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 downloading and executing further stages. Multiple URLs were found, some pointing to compromised CMS upload directories, suggesting a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3kab450e2rtmourbtj62jvnt38/43771315358.pdf In PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/61077129273.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/38m8kkn0n4e5f2u3sravs0rgcl/soxorurog.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/jr2ho94df33aegmcrkjtgb8543/71390659531.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wesarudenofivafaxu.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e1b2478e1---foduge.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/45542620819.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/17444190864.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/63j4qk1g1b33qt42hll2vi29u1/masemokenuxevatovixomuzux.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3a140b2418964a82b009c0aeecca6591/renapuzutivowuzetewojomo.pdfIn PDF document text
    • https://stopserv.ru/files/file/43466209004.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f3cb1e308---jarosobipeliketevosawev.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebc819f145---76241584814.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/eh099f396n53iqf5ji3mlopcc5/wixuketesogekuberun.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b28805a95984bafc0d009612906f5a5c/gubiporaxa.pdfIn PDF document text
    • http://philboyd.com/pefoviromaregorelepolajoz.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/xirixixesofafulunok.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6fa8867ec---6986688824.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/704b623ded799d7ce85f35c76c6a51a1/gepowajoj.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/padesinomabusas.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/53063292806.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ccaeb636a4---16857691736.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/pobifopevazapurasufevilup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834b7d61dc2---poxiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=nirbachito+premer+golpo+pdf+downloadPDF 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_off00015893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000170aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170AA 11104 bytes
SHA-256: d10d57137d0af7af08b4ec025630d4b25b3e66d8c12ffe5c2e8ec1b05dcef19c
font_02_sfnt_off000189ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189FF 21628 bytes
SHA-256: f17520e7b32f7b95567da77c855ae27f56435c33827c238fca9455636a1e1a23