Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe196d13a2d46d6…

MALICIOUS

PDF

77.8 KB Created: 2021-09-16 23:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c9c5797811bd9d1ecfb302651668015 SHA-1: 8eb580797656241e5eaa46fb0a2e8607e1eb563c SHA-256: cbe196d13a2d46d6bec812234a3e99ef56453348fdda03a33f6a6088c35d7ed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of hosting malicious content or phishing lures on potentially compromised or low-reputation domains. The document body is heavily obfuscated and unreadable, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

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://wastran.ru/uplcv?utm_term=harry+potter+full+movie+malay+sub PDF link annotation
    • http://fanghsin.com/uploads/files/202109110004532228.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109052306566256.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/85194342591.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/38416967632.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141671754bee---jekegesavinedidafomuwu.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/17601701982.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c968edd590---dugomijinipovazux.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/ligunapub.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/xegavuzipeliwijo.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091221125573499.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/kubufanu.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/91455811459.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad372a79f---dutegezefajavazinofomuk.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/56554480333.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/widavep.pdfIn PDF document text
    • http://kotolantopeni.cz/file/12740344175.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/tesakuratodevug.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/23126033699.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/sefusaguka.pdfIn PDF document text
    • http://headrepublic.pl/images/files/43045699822.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/m4n7gjbl9hb1aqivaldu70hdme/94461189762.pdfIn PDF document text
    • https://castel.ro/userfiles/file/gomomaver.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/88694711177.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/bo918s0e2cn7cftcfft24jsnqc/95285251447.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_off0000c9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 17672 bytes
SHA-256: 0d44f0ec97309211311d674a620bffd2f3f2882fbd8ecd776c795cabd9559380
font_01_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 10828 bytes
SHA-256: f297ff6545c701ea44fe277caf8a34f8dfba4ff25a6df8c818da3502b99a55d0

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