Malicious PDF — malware analysis report

Static analysis result for SHA-256 841ba28c352fbdaa…

MALICIOUS

PDF

71.3 KB Created: 2021-09-20 00:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 729c743cae99af76a9d2a254bb8dfbbb SHA-1: ad3033c674f422768eeea204fc6bf99cbaf705b5 SHA-256: 841ba28c352fbdaa92958f9f9fb3d43f9affdf48954c384fae72aa8c540e473a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=androids+and+iphones PDF link annotation
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0f70c3bf---52583206655.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/nitupevanekewoxomimanif.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/foziriwa.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/134996543.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/pagef.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb615e332---genuz.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138867fc09bb---78493203173.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/mimijiwelinajuwogu.pdfIn PDF document text
    • http://imbirimbir.ru/files/49222121743.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/56658869666.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/zomaxewivutuzit.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/lovafavimirepibekafaguta.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zetokasagigu.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/86353868368.pdfIn PDF document text
    • https://finliz.lt/i/File/keriboluparoxekevomivu.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/xafexogisanigugabu.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/dugotizixoxeweluwulalu.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/ketufuwovafiwige.pdfIn PDF document text
    • http://chpcentre.com/files/file/kidifujovekagobaxozosuw.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b001ca253---33018206546.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/599d063ada19baba8ed6ff28066bd43b/wejenovuzepif.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/52137377294.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/6727738922.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_off0000b708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB708 16424 bytes
SHA-256: fc840e6fe7f4b52c4ed10621f3616fdd19881267c6ede2fc812bfcfb403825b7
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 10324 bytes
SHA-256: 32c0df8c9c534e9060c5d78bc8b28f698bbd49477cd527fcca61b80a2ce57975
font_02_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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