Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cb4130b90a9301…

MALICIOUS

PDF

70.3 KB Created: 2021-06-23 11:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5b4b314b4955acf1c96595d5f866095 SHA-1: 5b5df4af1acec4f9116432e01e93968c30d55d84 SHA-256: f0cb4130b90a9301664d18ee177c5fba0fa2be3b1386dc79122f374188331b55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and embedded URLs are indicative of malicious activity, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c76d022a---24583385522.pdf
    • http://ahcxdq.com/uploads/file/051207419931.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d71a78879---99887684164.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/ogmg6kbdt8ia889qjfh1gjut8b/xiloxu.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6nuue6lvofuilie3b8t7rhji05/49569989236.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081fd240f042---42021540776.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0d6d875f56140d4e85958b9f221f4874/kajorawatozidinabobebi.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/ebf6516221084bdfa08ffadd014160a7/jopefajewerubarerufopiki.pdf
    • http://abwmarlboropike.com/uploads/files/wixudesowuzalefemore.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0150feb13200d3101aa74734e2d5f1c3/85470092916.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/c1ksa3fns2ujtv2kqea6v3o8f6/25645190389.pdf
    • http://aarogyamedico.com/userfiles/file/wevofoviwowari.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bb96e9ca4---sitopobosidodumujemenipe.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d5201dba5f2eab8a53296a98c7ecebb6/82027418077.pdf
    • https://artasedanasingaraja.com/uploadfck/file/gerij.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b668d3ed9e8---rudobuwezipepaxutidubisu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+king+of+the+bingo+game+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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d309.bin
30d62c2606e551b400180ad2485c82c0cb15dd4da8c64f809c0080f569858f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD309 5300 bytes
font_01_sfnt_off0000e4f2.bin
f08968c250512bbed0166f0f0c387bd438c97b7aac58dc01d52d1420fc655bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 11288 bytes

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