Malicious PDF — malware analysis report

Static analysis result for SHA-256 c833b9cd96604787…

MALICIOUS

PDF

82.6 KB Created: 2021-06-20 23:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 016c5ba0a6dd647cc6fe25b2e1be3375 SHA-1: ffcf8bc56a3f03549216d8651e80dbebdfa18e18 SHA-256: c833b9cd966047873850f95aac83d32bab250e6ef78bf9b2ecfc7919fc98f021
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a link farm used for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=cheese+in+the+trap+webtoon+free
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3440037566b4df10160f19b928ea6a45/ribumitavikof.pdf
    • http://feach.ie/images/uploads/file/mezesiranuse.pdf
    • https://alamansyria.com/userfiles/file/82898542101.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ca5b0f187d58f48010a4b2af5f8f353/gekijavosudizupa.pdf
    • http://wellnesszeewolde.nl/site/data/ws/files/15371216756.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e1db4643243d58bd3e462f42e7c0246c/98702704128.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160856fd2b82a2---44099559649.pdf
    • http://hysansam.com/fckeditor/userfiles/image/71371942381.pdf
    • https://diedacorporation.net/freesiafiles/file/11153960024.pdf
    • http://chickenwild.com/upload/contents/images/images/26837860615.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072f7f8e214d---bokatubapin.pdf
    • http://baloneacessorios.com/_upload/file/%5C/13102372845.pdf
    • https://serini-cloud.pl/uploads/editor/file/demozoz.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e18d235a1---93213735827.pdf
    • https://ludifrance.fr/userfiles/file/wutupa.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607816b2e1bc6---rafowarotagaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00011faa.bin
e7ac9626ec80aca775eb9806e70584331fad2d1325dc0a391a5c979bb6217401		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11FAA 18476 bytes
font_00_sfnt_off0000cced.bin
0001a2ef4e7cd92b56e9d47a7cff540cd59f7c6c9d0ca1034d6f8156acc5db15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCED 8116 bytes
font_01_sfnt_off0000e8a9.bin
63b47990238355e3bb511aef0f75d09d0132a73f397b40607a549814f187aa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A9 5092 bytes
font_02_sfnt_off0000f9fa.bin
dc15a403ccbba56de47865a2732c4df189e8040d9d33dec58059d61f68393375		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 11784 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.