Malicious PDF — malware analysis report

Static analysis result for SHA-256 d396bd00d341a46a…

MALICIOUS

PDF

91.1 KB Created: 2021-06-28 19:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c62fa97a6c135602c10a4c43ff4f6d49 SHA-1: 8e1f6ef0fc181b351da5d3c6228b4043dd921a6a SHA-256: d396bd00d341a46af30b258950541f24a43aeabc850685c76a56a1709061074c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on multiple compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c1f8b647---59236211958.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607181dfd30b6---87217663265.pdf
    • http://africareview.in/userfiles/file/37551781539.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d647fca1---81116929039.pdf
    • https://mvpartners.be/images/uploadedimages/file/58047826469.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6dd650acfd3683bd939f816b8814908b/9328682900.pdf
    • http://bjaimama.com/data/upload/2021/05/file/202105301053582055.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607812305b1a0---musofawonu.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e25d6dcad---banejaxidisefolagufekit.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee5ef02a0---jodaxukofewomaw.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/2t05qc4clvpgacrdhpqhp902v4/jubapev.pdf
    • http://dahchen.tw/userfiles/files/35098903223.pdf
    • http://nandeestationery.com/userfiles/files/35508460282.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3d8b99c6---tajaborijomorezalo.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9b8ad9643c3327211613386eba9b98e3/bolerejawokiku.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/r33hl8he7qtkmkdr2tgl03ebc7/99228817767.pdf
    • https://peterdegendt.be/file/dekik.pdf
    • https://argumentua.com/i/file/wibegalin.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a106872835f---96322932764.pdf
    • http://haohanlegend.com/Uploadfiles/files/68080688513.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be307300d14---lafatutomifasifupagavan.pdf
    • https://footballsod.com/images/ck-uploads/files/sesatobijid.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/9a94a3d1d0806e07b8a9cfa590366b76/viratapuneke.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67eb91c15b---47444069348.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7362272df50398f88688d4d7f6690b57/22455211060.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081579224538---3788315298.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=healthy+late+night+fast+food
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001006f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 16792 bytes
font_01_sfnt_off00011881.bin
323db17293191df97bdb320b02ea1f78fa2c4f6d903657f48ef0a1d8cce8b2e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 17168 bytes
font_02_sfnt_off0001453d.bin
d5d8765a7bf6c9a5a27070c62f93bb68e0ca12cc8c7c66c31948a0c08210bc72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1453D 10640 bytes

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