Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebffe2c11acee488…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 16:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f34404414110183307d1c83819945826 SHA-1: 547320921204970cd13095f4d8d27386bda22d16 SHA-256: ebffe2c11acee48814266d729961a799bdf730344b2b5c285b0f7939232d8c8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document likely intended to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://allytemp.ru/uplcv?utm_term=stamped+from+the+beginning+pdf+free+download
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/mamarola.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087d2f904d7d---5725645857.pdf
    • http://apexnepaltravel.com/userfiles/file/todokisabiralasajewav.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/im6k8be4d1kk2beejj39n8ked1/losifukopadebisilogena.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2620696001996a4d4e0240c69a94ac88/negatodoleverewufifufiri.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210629082707.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b1eb49d1d4fd01feeea13edf6fba9e3/xakawesow.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/igo8th4sb2d1pstphgeo15etit/tutafetopujopupivolixez.pdf
    • http://ewhamd.net/upFiles/ckeditor/files/lozirexabikewitu.pdf
    • https://mimpishio1bet.net/contents//files/nisukujijoji.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8bb8c313---67832657267.pdf
    • http://cuacongtudongbinhduong.com/upload/files/41526712532.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ccc24108e---sarawelokeruwazegad.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4a51ce68---zezonugabo.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160826d1d9fb77---pudabazukasuvaxoz.pdf
    • http://yi-xiang-yuan.com/CKEdit/upload/files/suzisibolaw.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20bb6e54e6---wumegutudibupu.pdf
    • https://samarpanbharat.org/trila/userfiles/file/18850726119.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f094c541a6210ea918c13072b7dd35bb/zafatipisewalozirizo.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/4325749372.pdf
    • https://airbays.com/userfiles/file/77446905547.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/pigesoj.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9700f20503---76777512933.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c5.bin
8da514fe0b8b49e0e0f04076425d821db7138433667cd7efdf6c60386a06a195		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 2328 bytes
font_01_sfnt_off0000f1e4.bin
be5d4d53d728e03221075ed695f2e1383c3a36e4ae48f8de549fe09a17124f0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 18000 bytes
font_02_sfnt_off00012107.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 16792 bytes
font_03_sfnt_off0001391e.bin
59391b723ba3cca4729cb7627a5fc78ac8379c54fe35a8ca19172ef5fa6e0053		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1391E 11076 bytes

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