Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e00b37f64af5c70…

MALICIOUS

PDF

75.8 KB Created: 2021-09-01 08:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be66585a38e81a7588a12790ac42794e SHA-1: b3219f4924f575dd2b6a456278de95c100d11287 SHA-256: 8e00b37f64af5c70f26a17d1a122204ee680ab8995afb8acec50cbf14a125fc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://syuncyoku.jp/upload/file/xixuvevilazerojuwibiwux.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3a8bacbfd466754c14f727e4d8321a76/68941430295.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/94278816582.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfcfd2b50c---lanufoxojotajidipilup.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/miwejijitenusumo.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/rabuludoresaruninigu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/galetam.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/219886150788123feb2026b54414d94d/botuwuzo.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaaee5daa0---51672445.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f292e75106d---volemezavijavijoribaxu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16116240d77c83---taselilaf.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/gerurirokeruxivojowi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c17454d59---pizadajamuxosijedosuzaza.pdfIn PDF document text
    • http://cke.hk/userfiles/46345501483.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/1907724450.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/94012053693.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/23235963456.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/46169410364.pdfIn PDF document text
    • http://thegioioto.store/upload/files/90877245300.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/6402251431.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ffe13a41418dab4386e33127ae95ac65/74801430095.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adbca0bb61e---17140162619.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160909413044c5---56013230254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sina+and+the+eelPDF 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_off0000c996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC996 16148 bytes
SHA-256: a54d801a4160fb28973bcf2ec65c7d7a0a9d106a81a8f1b774bf84c122c059a3
font_01_sfnt_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 10032 bytes
SHA-256: 9596e05a9d67ad4afa0037085565fdcd91f6d6612884874cc3b7d435d4deb43a

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