Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5d1e6c748721c7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 02:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3af5df54898b96da3a06d1bc670236ba SHA-1: 3dc7e36cbb318beaf37fc16b9a82f52359a3b279 SHA-256: 0f5d1e6c748721c7aed4f35e1b402ec8f0af52bb9be242ab19590128b7ec4a10
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to host phishing content or further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the true destination through a network of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed63e523f05---50888674799.pdf In PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/7224097009.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2f07n9v54vhq2l513mjlq5hlfq/86992273957.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/konoda.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/87660408995.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df58163eba---mukefafebilujeriwedur.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16090464bcc859---67768666534.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/mepogirime.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/suvaselajet.pdfIn PDF document text
    • https://citytrafik.nu/images/file/gokolob.pdfIn PDF document text
    • https://podimercrm.com/img/files/jekuvilewerumulakizo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/sv2002i06qgoc90nvu8tp06biq/mibepawul.pdfIn PDF document text
    • http://bomtvcloud.com/data/board/file/20210512172530.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/92445916874.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/lototuzalepexobosik.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202157959597555.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b50011297d8---gisupifigetarovi.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/vunavolubedus.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/63289109465.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078955008f89---xijiju.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/22789151010.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/55781265603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=regime+militar+exercicios+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_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 11008 bytes
SHA-256: 127d412769dcaf516db54ff470c9699c7c7dabd2a7818ca9ac896568654cc9b8
font_02_sfnt_off00011001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11001 19348 bytes
SHA-256: 8646828031c133601bbf59ec86294e0831dd30268db9e0633f89a3259feb31f9

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