Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccea29482aaea7a0…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 23:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 42fbd87ed087a928171b1b7c16bab55d SHA-1: 154a09cf05814749d7a4412f6d33c6ba1f9a07dd SHA-256: ccea29482aaea7a0cc0f00dfb621136722e0fb15641b551ce9c8593a6dd668dd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=ramanichandran+latest+novels+2019+free+download+pdf PDF link annotation
    • http://azbuka-d.ru/ckfinder/userfiles/files/12331173558.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/76838687437.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109111257282522.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/34800077450.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/dawuluzalepixat.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/28917991035.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/mezomawipi.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/69918621899.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/46992174312.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/92988561036.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03dab118c---zagilinumi.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/50801589705.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/wewedim.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161403f275339e---41267075793.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/21157755070.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mac654983ginbud3fm8uk2e52c/gisag.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/86441344107.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/64172245828.pdfIn PDF document text
    • http://www.buildonhope.org/file/53500326101.pdfIn PDF document text
    • http://tochuchoinghi.org/files/xarataturuxunivamobamuz.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_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 11544 bytes
SHA-256: d1cd5e017b7dc182321faed6cdbd0e7b027e8b5cecc5b56d91c4f1ec6864ca7b
font_02_sfnt_off000110a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 22576 bytes
SHA-256: 743d0b3f4cffc8fa24611d3a271b4a2cca5c77595bcfc40f41ac6715d6624e86

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