Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc68f985ec7a368…

MALICIOUS

PDF

87.0 KB Created: 2021-06-25 14:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd17c4b4681bec3ef74d20722432064c SHA-1: bec27c2ec7962c7918d631617d40a56c9d031b41 SHA-256: 9fc68f985ec7a36890daa1ccf0ea6f88f4a7bcb2bdcf6dbab4b0a526e1911a3c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, leading to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://accesoriosalmayor.com/images/userfiles/file/vuregakixuwokanajux.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5fd604a239aeae0dd8ca71463c1261c1/penufuragoge.pdf
    • https://pharmnet.cz/ckfiles/files/files/tekatozuvumovafenezol.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2af16bbe---55314557157.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/8gdq9m0qmpvrboqvsdv1jvpvvb/zifer.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/1c54d65b634283c60ea79e46eac4b029/jusurefup.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c41c88c298---62666633615.pdf
    • http://hnkingdee.cn/Files/file/20216108931.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/e878453ed7c66ba3664bde7a324bc360/23149496044.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/59706755634.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/1f317f8ed811a016bc6bae28cfe83fe2/75525384878.pdf
    • http://razaviota.ir/basefile/razaviotair/files/fesarupumorujivefazux.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/542ikrnr9ttlgamhmn1hun0rf4/tupepunaxadomusegaforuja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dysfunctions+of+a+team+pdf
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f150.bin
018042d1b1c8e5acd211fc81e131a1390e0a8b4af2ecfbe515646d7209f32a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 17316 bytes
font_01_sfnt_off00011eb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB3 16792 bytes
font_02_sfnt_off000136ca.bin
c979e5a1e732246d546492ff39c51e4c7cf3f85328ba325b74c9c47b0665683b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136CA 10848 bytes

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