Malicious PDF — malware analysis report

Static analysis result for SHA-256 b189c4ae300ac03b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 06:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eea876132fdcb650f1bbd9ace956a8d7 SHA-1: ded8c1c077b2fe779d5307ce5de1797a71abc1a2 SHA-256: b189c4ae300ac03b31068d14039bf9ffa030ec8eebc6ceef8b293bc43bab26e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, characteristic of a link farm designed to redirect users. Heuristics and ML classification strongly indicate malicious intent, with ClamAV specifically identifying it as a Pdf.Phishing.Trojan. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.amedna.com/userfiles/files/binevaw.pdf In PDF document text
    • http://paradoxine.com/upload/files/nobifomab.pdfIn PDF document text
    • http://chamdure.com/DATA/files/fofujanunofetoxubal.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/mofonilazedagek.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/87286241698.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161366f0b0be1e---jugexixamizeweju.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f420e0881---41495893201.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/nesogo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451fd88ee32---dopamazemunegawirusuberot.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/53678261003.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/mimivuzawovuvazidiwukuf.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/lekejafemigojeselexu.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/vobesum.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/dabiluzazoribetatexaraw.pdfIn PDF document text
    • http://pvvc.cz/files/73519893749.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/nomepowapimukofadoliwi.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613825468bd09---81738478408.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/4501178322.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/kubopakudeweruzujosibula.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/33901827362.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/786c34aaaee8e19898b385e43e4795ca/46891306681.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/mofatar.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/1116006408.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/vowava.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/pisuvegezebek.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/sakunexetudalaf.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/bugukaxusemexefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=henry+stickmin+unblocked+gamesPDF 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_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 11152 bytes
SHA-256: 76fe9fbd53f90e8cb521cd08527af234ad8a0125dbaa016d209349ff89feae8d
font_01_sfnt_off0000fdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC4 17884 bytes
SHA-256: 8da3454d96490e1a6359c9090546ea05ccd05e4746da9e53edfde1fc5ea3c6a9
font_02_sfnt_off00012ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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