Malicious PDF — malware analysis report

Static analysis result for SHA-256 c954cc393e7620e9…

MALICIOUS

PDF

135.4 KB Created: 2021-09-08 03:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 938cd16cd4a329a40958bd19c97a0616 SHA-1: fec9caf585ded0a87f9e9bd1aba274d77cb109a8 SHA-256: c954cc393e7620e9b440ddf816d7f22e6fb6027a0826819d170b9943c91d30f6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://ketchas.ru/uplcv?utm_term=acid+base+salt+notes+pdf PDF link annotation
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6021a8d2c---kedigoragudibonixokaronu.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/resekuxonozeb.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/1952024345.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/97885129612.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16233459253941.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1f746ce874fdf685f0bcbfaf095805a5/25776995775.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/63rp7s1b5ra7dc604jev4k5au3/74768508997.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e0778192a01398dba05cd6cd7d5c6b3c/figum.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/wifufogaso.pdfIn PDF document text
    • https://assistenza-termica.it/file/vodexelotifodeb.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/sisetafafeluroxobakivup.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1623312706.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc7cbcb3ea---20217441132.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/nuselu.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/baffc00740dee0bc8850c029e65b4416/vitawabut.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bf857a6e984---kaselefobaxagumi.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/119f7ee9e4a4a54eb2207c938eddb8f6/juzisidizafojufi.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/kudos.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/86761629217.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/fejidutedetepokerun.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/zazugodijotonew.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/82e0a76d80092cbe589edeac36064949/zerez.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_off0001aa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA47 20172 bytes
SHA-256: 574b9a1df1f4df78d0b4e04d185cf28583fca87e5af16be4063865bcb0947bc1
font_01_sfnt_off0001df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF10 10636 bytes
SHA-256: 71b1827a6b594629bb31c7d931c478c990ede34b173ace1c919589854dae0d92
font_02_sfnt_off0001f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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