Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd8cab5999b49bf…

MALICIOUS

PDF

74.5 KB Created: 2021-09-07 17:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d0d1b8e675f32fd1be4a5774379b8ff SHA-1: e0ba3372b58c5a269b4cb56ced186ca05f7b23bd SHA-256: fdd8cab5999b49bfb22e28600e0edbadb0546955fe0110a9606151cd052f65d3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=kindle+fire+hdx+7+3rd+generation+manual PDF link annotation
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/pojadekakodekag.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///10003362767.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/rovumevilivowotepafubu.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/futiz.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/subapovurin.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/27922153330.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/3923316786.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611c6e952bd6e---vidadokakotu.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/dixasitefoxewagevu.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202108151800021990.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021825132447476.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/taxamiziki.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/27768788462.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/20071431524.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210822002457.pdfIn PDF document text
    • https://triosms.com/userfiles/file/84466887852.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c48dc59a879e29822075c21f1a2d9cb7/nufuditi.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/talazowitedigafira.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9601f8d005---jafujutinewosasupawekud.pdfIn PDF document text
    • http://vertinu.lt/ckfinder/userfiles/files/jadotugazago.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1611f98909571d---tewibabajugojaxike.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/56096f90a8d1e669f81eb77982514fe7/21945956730.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/696c3277295ecab93dcb388f04fced66/pekelawuvax.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/dfa504d1646bbbcfb0c095a3e05e6d9f/20100140558.pdfIn PDF document text
    • http://deficanderel.org/clients/6/67/674a09facce11b7629d390eef9534ff9/File/45493132754.pdfIn PDF document text
    • 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_off0000bce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 18056 bytes
SHA-256: 08e2e4fde9a499d3de3ee3fcbce2e6d643a33883d1f2df14105940747c9d552f
font_02_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 11048 bytes
SHA-256: c304442e90ac53494ccf353ecc0ccbd4e945b8e15e4bdd4661aa6eb7700b33e5

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