Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc5f6f7506af66a…

MALICIOUS

PDF

78.2 KB Created: 2021-08-07 00:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 905e35078d00f028220c0e6c0c296300 SHA-1: 66d73b538f9ebc259bb232971d3e6f250543586a SHA-256: cbc5f6f7506af66a98a51ad679350014009ec14e3fe78647892e8859a62631ba
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised WordPress upload storage. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7431

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://aadhaarretail.com/administrator/imagetemp/file/3089625128.pdf In PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/35750040432.pdfIn PDF document text
    • https://kuepancong.com/contents//files/24686185602.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/lenirazusepam.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1610110ef995ee---4214363295.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733f620e32e---20367501922.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/5900436930.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/rupuxikaputap.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/64542393923.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79866007fb0307b0fc85dbb8be8f91fc/92169114834.pdfIn PDF document text
    • http://goref.ru/files/file/9470346732.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/18460955d7746b776cc3df0e5761b31d/sizugavanuli.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/475b645b461a4b491f774d15e9275d2a/tofozegusarolaraj.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/89680201729.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/biripixamimogow.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/38309258940.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/76409052216.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/34glist8otmrku4k74pv7ib84b/betefexerawepudekazuxuso.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/71120600586.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16087c2e578ee5---vigife.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/31548758988.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a446943219a---liduwo.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e675c1e1b---56435915507.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162393004947754142894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+use+ghost+white+tonerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 10356 bytes
SHA-256: 11bcc23fea0920995d62e745af802e5dd603f9ab5b971b6ed8e1c01217fd1c21
font_01_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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