Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ea861075cf8144…

MALICIOUS

PDF

81.8 KB Created: 2021-09-15 02:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 14ad281f6c9fb2a2060d5ac94a23e1c4 SHA-1: 67c5f989868011440c51c8b763a6e135c282790e SHA-256: f7ea861075cf81445b8bc392766711b3eb32aed2951b66e3b1a1e0244185df3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=gods+and+magic+pathfinder+2e+pdf PDF link annotation
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/58898032334.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369fc6eb5b5---80293484038.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614037b5e7568---siginav.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161390622db339---pewunegixulowejipobi.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/tavuwirojamuzi.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/tavokesasepo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613b75d4326e3---papekofomisuranaf.pdfIn PDF document text
    • https://atiksigorta.com/files/kerosoxora.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/mafuxidizex.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///99826560762.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b70f887fbd---tejijajusipulamoze.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/96788378547.pdfIn PDF document text
    • https://digireg.sk/upload/4380486286.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/timivuv.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/wugabusirexikozenazuzuja.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/91376735846.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411de5f0205---97400088527.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/28636320622.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/22994976999.pdfIn PDF document text
    • http://sun-eko.eu/files/file/33989329868.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/1762152795.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/ragisulawedejin.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210913191918.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/35396153857.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_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 17828 bytes
SHA-256: 855492de0a7013b199d3f16a339ff3095d39f12afe797dafa194c0e06e9dbf55
font_01_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 11180 bytes
SHA-256: aed18d7fba160e72756b5a6a11f709e8801ab138f4d5cd8206463034d1ba526d
font_02_sfnt_off0001212d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1