Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec93f8541843ac6…

MALICIOUS

PDF

76.4 KB Created: 2021-06-26 00:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba61f7293f63a3741c84f69da5802d1c SHA-1: 936ea7b4beb1aded889ed31a03add01d57d228e5 SHA-256: eec93f8541843ac6dfb9c50f8c1d2a93dd4780a924d435837b066520ea7c092f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is designed to host a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087c87a2f315---26198197438.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c33a7c8b866db479baf1918056981070/56307770406.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff75dac62---85914525043.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083afce9141d---1866672598.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3f5469ab8c1caf0bb755c80ada4de791/30775624148.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9423712e---pusaturituselupag.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8a5b425efc67757ec6f955ef896b5f7e/boremabunuled.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/nerarirodowu.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/geruzupekotepasonufuti.pdfIn PDF document text
    • http://wirheiraten.de/images/file/40326669162.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/77911377005.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/88079379074.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff47fc7f49---pudefoxifamolub.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o2o8g3lqf2ko34mkdj5bvsonp2/lolevomoxoxerofibo.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c226131501---widigutezupejonugo.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/vuxolazagodegomemitumako.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/79682924551.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/0e716e607b9edc4a742e5d82fab47ca2/pugopiravepazutebof.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c10ff1fb89---xiliwojamikebiril.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a53598b944c---jededawodopolirujile.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8e38474d2---jasepexunalewokubare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=diary+of+a+oxygen+thief+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_off0000c6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AA 10780 bytes
SHA-256: a98bea58f36646d1a027f9351364d8ceaef5477248ff94eb706abca3f65ae298
font_01_sfnt_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 16864 bytes
SHA-256: 00b22c3ca228676f41487d77653b57d82aa1d1f90d2837199b3bb192589de3cb
font_02_sfnt_off00010ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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