Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c57bf1f70738303…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 17:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25bc90d11c5287bc8f3d98289ce9fe5e SHA-1: f74f2892443add4671d4a0940b32c845a685778c SHA-256: 6c57bf1f70738303be48065eabd7a78415d973baba41558b50b0bf5bf229b344
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://gsm.company/ckfinder/userfiles/files/26551679808.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6baf15c57---78187545369.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/53501862085.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/73093120822.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/55149613056.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/56196502436.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/voxoxagumenexetodefe.pdfIn PDF document text
    • http://uci.ir/userfiles/file/30992152999.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec5e703c97---lenuxasegafezovasowuxot.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/97124420038.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/82548057635.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0e900ce7---rarikukefadodewuzul.pdfIn PDF document text
    • https://brmc.jp/user_data/userfiles/files/12018183393.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/35793647885.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fc1988cff---zapuvotewumolupimavafum.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b932b743---75612793085.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f3233506---57695562504.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/76146390323.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/xikemuxetejoni.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4a771091a---59696576126.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799e76e54f8---78131315839.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/37181685587.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2c1cd486a---foguvobugozexexuv.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/lukelotafalagak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=differential+equation+books+pdf+free+downloadPDF 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_off0000c8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 16764 bytes
SHA-256: 6754160605656fc6172780406a387245d96d5860c8951cbcd79df05bfba969d0
font_02_sfnt_off00010bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD7 11056 bytes
SHA-256: 947f9e8ac8a2aeb700bad6097a992057e6130e63009df92bedd930e5e6b64d85

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