Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f85477e27e708c…

MALICIOUS

PDF

78.7 KB Created: 2021-07-30 10:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 585c3e233bcd3aee722b1fa8ccec0284 SHA-1: 981d9614c3f0282d7214bff2362404239e45ad0d SHA-256: 98f85477e27e708c0975e785675ce49cbeca7e10740c6ac20d5ba93454f98643
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by the 'SE_PASSWORD_ARCHIVE_LURE' heuristic and numerous embedded URLs pointing to potentially compromised websites. The ClamAV detection and ML classifier further support its malicious nature. The document likely aims to trick users into downloading a password-protected archive, with the password provided within the document itself, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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
  • 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 https://synerhu.ru/uplcv?utm_term=heat+mike+lupica+summary+chapter+by+chapter PDF link annotation
    • https://mobilieroccasion.fr/uploads/file/7012884377.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6e4c0db32e3f4beb8c0979372956f93f/99588567526.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9eee3bf0b8832942808aeced2a3afcfc/2239132738.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078efced5b59---19638011605.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/49797502069.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/426e01c1052ac97c151551ac5a32d070/tilefosiw.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607051d7aa63b---kalusanalukakejejesu.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/bomatagekegupukija.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///39155398778.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/famabibibasolu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f371245a2f---tebuj.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da3c4ec0080---nenogisaxovum.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///minom.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c226801d5---91790596552.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe5007ec1c---83371661410.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/12169669198.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd0172669e---60947190714.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/52535411099.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/28743032606.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/mupifujowubisetiwep.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0gge4cp5j1bv644d9t7ig5i4j/25219206435.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/28851796985.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/tejesunofofomurux.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/485fbd1a43c05696e9247516001c5839/10722515585.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_01_sfnt_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 10852 bytes
SHA-256: 6bb7032658dd8f1a71152fb640ff980d03b35619cefbd10a5630b6b8278a67db
font_02_sfnt_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10158 16788 bytes
SHA-256: 0bfd52ce95ceac51961557a0e5d116a2f9ca5831d3c556fba32ba994b04da6cb

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