Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6b87a8d4a2348b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 23:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82bd2d308f218ae53df87fa951d0f125 SHA-1: 999f1ed92d88739c4e48059db3c7f139ca70d877 SHA-256: 7c6b87a8d4a2348b496a18c17c46fa89f8cad624d348f3018e401bc1f202edaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e80081d32---pigopidenakubimamawu.pdf In PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/o3efctsqf7st5vi6pr9v7j83nq/46351444781.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1611d41d162baf---womejebuvijenutamunof.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zatufosisujadumak.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210813203836199.pdfIn PDF document text
    • http://kahasat.cz/data/file/galareta.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/diwovilikatep.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607c47a39a71c---diloja.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f857f1a298569b04a511cb65ba0eeb88/83582869129.pdfIn PDF document text
    • https://laser123.com/geektic/files/93187659468.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/62978599199.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/rijojumaxe.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/pofivibatakowag.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/760113a92e87fa3a0f4293f33f54752c/93448902492.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9cd3ee7f---17726369576.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/5327339311.pdfIn PDF document text
    • https://tepihtrava.rs//files/39917114195.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/49806949848.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/69042219940.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/pedubikuposobiwode.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ep7sm6hdh072fr1adrak4mpraq/98942908298.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/42234223732.pdfIn PDF document text
    • http://sjhtractor.com/d/files/xowifosunuserinerubor.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ugb09qir4bp0lpv7elmcl2vjna/jupikuvigapixeluxigawi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada09b0434e---76430625657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=biosecurity+act+pdfPDF 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_off0000e498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 10732 bytes
SHA-256: b16dbfa40f3f74e261186ccd47b0b310914ec30aa6f84a556ff29c14cc799c78
font_02_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 16860 bytes
SHA-256: a94e92414003fe170b2d564d09978f698f396c69c2c37fd841f635f4b4ac1c52

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