Malicious PDF — malware analysis report

Static analysis result for SHA-256 78961605981386fe…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 13:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a2bbfbdcf7a96a2c41bc142e2f56c71 SHA-1: b28f6a409ff74880dcd3bb829521c5ef4959c12b SHA-256: 78961605981386fe5b65fe1df20945f2eb413875b8ea6c79028b16ee73e5a5f8
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly suggests the document's content is designed to trick users into believing there are new or changed financial instructions, a common tactic in business email compromise attacks. The presence of numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, further supports the idea that this document serves as a distribution point for malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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=astrology+calendar+2018+pdf PDF link annotation
    • http://alltechsro.cz/files/21815977561.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dbe08be34---nozitofalawolemexuwonux.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/faxubisan.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/vijulexojegisun.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/xelepolavuniraveto.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/dmnu89nlemc6l3ebii33ml7t9r/22249960943.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/36098684805.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/duwuvabujuse.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/54891836144.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/59769829097.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3565bd5b2efdc55178cb1f759754ef9a/danonexovaxugew.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/20638273742.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jjig36uoogqvk7buc0fa1jlvg6/sadutupasedekeviduwu.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/juzuxamexitu.pdfIn PDF document text
    • https://empresa-venta.hr/files/49737232021.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/pogolalirobezujolito.pdfIn PDF document text
    • http://foodchemsino.com/d/files/wibinakekifapewetuzil.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160f9eaa834b5f---62255239744.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a613d30698c639fe1302721b5d95a27d/77828252130.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0gvi76f8p460n5s1hd3j17nqk/wefukobotibabelalili.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93d70cf463---vejerasan.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d0a9de3a---23055913853.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acedb877872---49390411964.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5e05faa7bd436c0bab1ed6337b860b2e/vubenase.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_off0000d664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 16304 bytes
SHA-256: ab3a1ff1920f9b81245e6d95df762ab61e4dde7ea9b86b0715e2baf60e11915c
font_01_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 11300 bytes
SHA-256: e411fecc002c7164e0fc4eebfbfc4c33fcd354d827333462eb485d835c1eb9e0
font_02_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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