Malicious PDF — malware analysis report

Static analysis result for SHA-256 8690f979ff90a7a2…

MALICIOUS

PDF

97.0 KB Created: 2021-08-17 19:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c30d220d09a8ea0f454b16cd404ae153 SHA-1: 3ad0c3a25fc92d6efd74d764093f9edf5c5241b8 SHA-256: 8690f979ff90a7a219f10830cd67fb8790908b8605d7b5922b3672879b0dcd43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and numerous unknown reputation URLs point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b248b53db73---31147790897.pdf In PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/pizimuzisamubudedusimumo.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/kabafebobabofurorovune.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb78d46e0d---fexulugavova.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/botepogawirobiguraxu.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/katukepujadawogiwev.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/futona.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a7447a546---11595944444.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/6shfr90m9tsqad8ll5l25ckf58/difetibiwarekoposub.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160705b62279ad---bumoxapiwasegujapimuvudap.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/23c9eb03fe8b236d89ab85364d3922ed/83383119956.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/gixukujalodipaxijirage.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/lre7qgo8q8kf0cbaib9mslnlno/7358033684.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb4229fe98---faxibulakitag.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094c75707a8b---22099737590.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161037f640402c---kaxabexujapo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9cqel2gm2lr0v3im8v06p8ga45/26339883932.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddca79930c5---witajebo.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/tigemadadozuke.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/30197234479.pdfIn PDF document text
    • http://svx.su/ffile/file/dupuzameze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=total+war+thrones+of+britannia+mod+managerPDF 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_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 17420 bytes
SHA-256: 4b9aaa21a8354dc450f121d211d2713b4d670df9b69d3fe601eadbbf0a4ccee3
font_01_sfnt_off000142e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E0 10988 bytes
SHA-256: 393fd13072743cc6dabebfa20f7ec6e9efd1fee7f226cbfb3589a145a9f50eda
font_02_sfnt_off00015c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.