Malicious PDF — malware analysis report

Static analysis result for SHA-256 b438e1846f463818…

MALICIOUS

PDF

69.7 KB Created: 2021-10-07 13:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3c2d97ce5256539d78ad87a1f5ab80f0 SHA-1: 4ca50368c84597d1e3a8a93098cad895f81f10dd SHA-256: b438e1846f463818981ca1f9757de4b45744f2d3ae8bf34cebd417969fb4b9e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were directly extracted, the nature of the embedded URLs and the 'link farm' heuristics indicate an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://postelezmasivu-praha.cz/ckfinder/userfiles/files/fugutasuv.pdf In PDF document text
    • http://rassadaspb.com/new/files/file/tifevezesitunusibodip.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-27/20210927094355137297.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/nemexipaka.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/bipitimajovogupuvikuru.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/rolijodetitafaxumev.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/niluzeneditesezevej.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a3dc10a5ca---nozoruni.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06360e285---93735323033.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/52250743708.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/517586400.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1da92b1b8---36229146880.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/vexuvat.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ac4c66ff962a0d7be946a7d6deafab58/25761593854.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c8a3d4852e---dazis.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f4055b4fd---belez.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/fvbh7tun90iof7joofs6odv69t/32108407773.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/65031843417.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/josimezekemijewifitabekub.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/98858075069.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/94834067597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=knowledge+skills+and+attitudes+objectivesPDF 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_off0000b0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FC 15200 bytes
SHA-256: 779cc8b5a5ba69c75de879bbc4d5aac01d505994bfa03b74ae1320790105d0a8
font_02_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 11052 bytes
SHA-256: cbe288b7687f927e3dada9278788e82035561a5cb0a63420f8cc9d24c4b7c739

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