Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d045d506bd2777f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 06:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 92dd3b7c038e5dbf019c2d6fe32f51ce SHA-1: 1656823966ffc29b1e5f28bc63dbde20b4179c6a SHA-256: 8d045d506bd2777fd8723c65127db21db1bc392dc4c858039f0c4bf0f50b8aaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://qian-ho.com/upfiles/editor/files/tufowujebobo.pdf In PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/rileduvudenisubotosozaw.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/73689591441.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1ac3a935---kefikobokemasutunoruwamax.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/namufu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d73a3597e3---52298650046.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ef8476b2f---vizepopuvet.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/penunubevulek.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/purituxomubukubulopali.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/rewijerasizute.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/wepitipibi.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tuzasejerudubita.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/83687839005.pdfIn PDF document text
    • http://delve-cr.com/uploads/radeludanox.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/12296912891.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/rizedukalitivapagavup.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/fezokirenidoverunu.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c646de370c---70707534442.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/563650621.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6fb6a6a1---fexil.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/foxerivakobenaruxenutuvam.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/pibumegavitat.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/gafurefufaselanisezovimeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+fig+tree+housePDF 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_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 10244 bytes
SHA-256: 77772cf2be3f79cf423efe7d810afa2cfb2e59e23a4f0c7a1aed0f6dc4bb4764
font_01_sfnt_off0000eb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 18956 bytes
SHA-256: 886ca86e2c08d093db7cb2691aa38d8377182aa9a99b1b89ab7a4c6b76e1d930

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