Malicious PDF — malware analysis report

Static analysis result for SHA-256 912ed84da97e5e1f…

MALICIOUS

PDF

73.8 KB Created: 2021-08-11 02:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c51a28fc3d0bdec05403e9b00407750 SHA-1: f26c86ac37f59b1ef20969e0712a9573fd844f7b SHA-256: 912ed84da97e5e1f4d54485222290e1d9260343d656e5501e68227c63a25d11b
156 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 a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The presence of multiple external URIs and the nature of the hosting indicate a coordinated effort to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://krisoc.ru/uplcv?utm_term=how+to+know+if+girl+wants+you+to+kiss+her PDF link annotation
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9f08bvm5916o6nq07sfjm5lb03/67334905744.pdfIn PDF document text
    • https://cityface.cz/res/file/zupupuxabikev.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0812b1079---64601673324.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/99627176213.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/405308bd5002ab816707e823aec97dab/35965519265.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b535910592---sitekugulekag.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/63372655419.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/2ca26885d2188a53a25840e94ea37a9d/mumasijivazik.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/81462585870.pdfIn PDF document text
    • http://jar-ted.pl/file/totodafapikubuvox.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898df7dd57d---34393509215.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/ca7c5d4a23483fcdce7ec764ffcbd622/73360013707.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/radige.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/16486167467.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb62ca2eb2---pavapugofetusexaxi.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/10241391248.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c2e64cb0d---lubinalujivipebad.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/57769847135.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/74343287454.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/xijirunisoxekesebifob.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/lavuwakapa.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_off0000bf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF03 15032 bytes
SHA-256: d0f85f8b419112caf9281a2b0763e4b5647c11ebe2cdfe6d94ec58300c9344a0
font_01_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 10876 bytes
SHA-256: e8c400842c987353b80b5416438b3355888a4fd856db87ed828519f0585379b8
font_02_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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