Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0c0d7e88638fa6…

MALICIOUS

PDF

86.4 KB Created: 2021-07-29 22:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2e34e74f8a01150ea90e51db18f24cca SHA-1: 9e93d011fceb2c53721a543548208bef27441b95 SHA-256: 5d0c0d7e88638fa6e72c0140e2fd0740a9840eb0e3b133812a774cff78fdc8ff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which host PDF files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.ddu-hk.cz/ckfinder/userfiles/files/kedavurumaxaw.pdf In PDF document text
    • http://cke.hk/userfiles/96342739455.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/paxarodomelufuregawab.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e04df260---99828290667.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d5b86da29---jokowolesebera.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/ruvunesatovepidapekam.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6052b6f76d---tugijamoruxexejavojoma.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed2718d65---nisusixumo.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3fefc2f70---texaterijuk.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/fuziminuragojopazeg.pdfIn PDF document text
    • https://samudra99.com/contents//files/bapigibiwewexufi.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3e41gg7n9au4lnn2ep7tkg25v9/92061398795.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5a7619709b2561b1ce2dcffeee67009e/88514407214.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/93556113897.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160948adc1e0ae---wanozadalekosenasipajafa.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/56884443428.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7dd5fff6b77be286afd56db8809992e9/lobozuritase.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/82287666762.pdfIn PDF document text
    • http://caramelitos.sk/files/pogibulisafawugugavureg.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160fba2165d6aa---lewofumamazedimixorekebi.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/xupojalug.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/49346832109.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/62426031843.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/757e82249f8d28f809e6d0741390e07b/xobapamenenumatad.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d5fd4c8eade06399d7e48c3d2ac7c6c5/modoporevisiwagaramad.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/naxukiwov.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/vupulikegipefumer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=calculator+vault+app+hider+premium+apkPDF 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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 18452 bytes
SHA-256: 0323473df3a781b83db09739dfc1e3920c5c64dbc39c07841bcc5dc9794d6332
font_01_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13258 10796 bytes
SHA-256: 60cda584f00244b1fd4ebda15578b68a99d17eea27ded144d650a04284c3fa9d

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