Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bdf7ae6278dd0b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-20 20:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4766b10e9b26e0b43d04c634d2f4425f SHA-1: 7bd3b087e543cd6e984285f3e5c87fac992768f9 SHA-256: a7bdf7ae6278dd0b9a5983825e6de8552bc85353b6f32e1ee7975e98c7286539
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it may leverage embedded JavaScript for redirection or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://kvzriu.org/images/file/worusoforoxen.pdf In PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210912_0026EA491C3C3834.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/77fe90e2886a9117d6655ce576c0be3e/mepafewezor.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/56766645256.pdfIn PDF document text
    • http://pneusmarene.it/images/file/85422969112.pdfIn PDF document text
    • https://khanikango.in/file/81481160771.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/24127752668.pdfIn PDF document text
    • https://faceless.me/userfiles/files/sowomumonijava.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7e1153b9412fe312f93e77373ec5605e/76855232361.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/wokewizolozojamivona.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b6eb78e538cbdccb2bbf2720f9d63d78/rakuzofejawezuba.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/14499176265.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://taxfreepoint.com/file/gixidokizikab.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/29282501076.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210909_D1E91A38DCB59DE6.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/lezenomimurozadulogu.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/vivazinemufitufazezerix.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/dulalevo.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/42157302692.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/fefabomirekosiraxafupefuf.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/bafuzigipibodukopabiw.pdfIn PDF document text
    • http://elpijisystem.com/file/feragudojadosu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161416d65e572f---43066234033.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/valufuwul.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161346355a8a1a---zikak.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/nukomukizaxowisig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=bastille+day+putlockerPDF 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_off0000b9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B9 10760 bytes
SHA-256: fdc7b6fcc0377320cb04cd5b9bdf3fbe08cf37308ce654343b0509aec68d433d
font_01_sfnt_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 19048 bytes
SHA-256: 811e3230af79a1bed3ffbd77eecb4a133e79f71cbea3ea27068e91955a5d3f11
font_02_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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