Malicious PDF — malware analysis report

Static analysis result for SHA-256 720889c57f56cc9e…

MALICIOUS

PDF

165.7 KB Created: 2021-09-14 14:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6eabf1f252c418ee7a656854519290a8 SHA-1: ed02293c88f233692a9458a72268874d14d0dbfd SHA-256: 720889c57f56cc9ef8b93f7c4f9d3ffc1bf082a6497ce04e59a503222101b252
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 a link farm hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The embedded JavaScript stream, though not fully analyzed, likely contributes to the malicious workflow by facilitating the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • 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.
  • 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 http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135b649e133f---jetinafiguw.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613389d483fbd---1219090919.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/kajafigo.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/35896067242.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8ad8864b---66893516896.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/84003273311.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/12456900531.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/39379297643.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/53268377630.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/rutamilisojemaritosugem.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/44825238452.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/rewipetenux.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/fekawawigeguguba.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/iuhinm0cl6qtucki2p97com7oe/82785008133.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/jabedufusexelamesive.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lq5rvb5oklvu6l5v42kjb2cis2/lavivim.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/fositutumasuguwe.pdfIn PDF document text
    • http://floramarble.com/uploads/15154081169.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/65391951314.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/mezixaze.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/49992446139.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/juwuwufupopozakuragef.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/90423813752.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/082011044180.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/jigajijinowagog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=rooter+app+link+downloadPDF 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_off00021d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D16 10440 bytes
SHA-256: cb2fd3a0605bf73921a99dcb8b9d72e3e5be92c71d51abf22c40fd4fc4cead16
font_01_sfnt_off000234de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24CF0 22200 bytes
SHA-256: 1bca341ac922afc27776c21984c12c9cd25697fcc20a50c68e7ba844c1a2fa6e

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