Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb973ccb4357400d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 20:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 377629d53f865787f89dda9100e5d8ab SHA-1: ca2685c70431ff6c91711d412a4c3addca65acbf SHA-256: eb973ccb4357400d9cbf9225cfc091c83ac41949f52889bfb108d74afc9bfaad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that this PDF is likely intended to redirect users to malicious websites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=les+neuf+marches+daniel+meurois+pdf PDF link annotation
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af04b0172cb50111b90faa2f35127668/pewanajikagudef.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/98203363092.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/81751550951.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/jisine.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/65253477511.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/12897190215.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd07d2b4ae---65046577676.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/wubabijekewabesagofogin.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/83168551302.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/177526e7d2e94fcab2e03ace6e0970f7/fugeneselowekodutoxomoza.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/31953941231.pdfIn PDF document text
    • http://coffee33.ru/archive/file/xiwig.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608391fe466ae---lazawapobarudim.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2be7a5554---pukevez.pdfIn PDF document text
    • https://medtek.vn/storage/file/farizoxegir.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/vemezusaropudijiso.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/bofowopezozupiropaje.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f425b0a06e1---73699164890.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/84537016534.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/263fe444ab6b14bf439f7358f3a0420f/86384274905.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/gogeji.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/37468040019.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/35679016790.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/7452387866.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d001b63015f---kiger.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606eac2fdc38f---48320905107.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_off0000c93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 10844 bytes
SHA-256: a31e24c5e466063a0d3942e5102408020a82d7ac313cf5e55b7886c912e89d11
font_02_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 19040 bytes
SHA-256: 585551de764970aa9a9d0c85187084c913e083f4f766299390cd5100eb309a59

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