Malicious PDF — malware analysis report

Static analysis result for SHA-256 311cae962c1a483e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 12:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d297d14c45f0677e034ef9fc9feef72 SHA-1: 0ebace1ad37f09ec300ee6bfe60a6b86f7ee1bcb SHA-256: 311cae962c1a483ebd702bd6511652860ad5406dd35b925a7f53bc060d4ab33c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://takitech.hu/userfiles/file/55142610721.pdf In PDF document text
    • http://bitree.net/ckfinder/userfiles/files/nudagufodovuno.pdfIn PDF document text
    • http://4bx.pl/public/file/luwawefumeve.pdfIn PDF document text
    • http://ceroki.com/image/files/83742313644.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dbec5136d---70242194452.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/rimaferoxekudote.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/62043411574.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161354aaa75350---91589847290.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/74202381083.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161396f5b52f79---kikupekufasunok.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/toseper.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613451dd50f77---nipizotot.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/wameronijomeneto.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/79538684467.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/jatanuzapupel.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/95207908837.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/11849481722.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/bidakefogaj.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/dofurunikelumemidumo.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/jamotetizane.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/bizowugod.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/dafeguv.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/revuvudaguwolivetipozavup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=words+that+start+with+l+to+describe+someonePDF 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_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC855 15228 bytes
SHA-256: 5672c50f792eba18b0b6640c79d16565199f6209ec58950aafc462b61e59e8b2
font_02_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 10856 bytes
SHA-256: 9855252cfb827fb74d82a79ac68cc28b7edd5caf906651b89304649e20b96715

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