Malicious PDF — malware analysis report

Static analysis result for SHA-256 287098d54fab7f1c…

MALICIOUS

PDF

85.3 KB Created: 2021-08-25 10:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98c3b6d8c0745a5a1d1fcdd9a7ccc190 SHA-1: 8314fa4006fc28fed4bee3f3cc34b5903f08ec8b SHA-256: 287098d54fab7f1c8ce7b9f60c8b1b1821b19cf5ac2111ec88168466f15ba066
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous embedded URLs pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of a link farm on disposable hosting and compromised CMS upload storage further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://harasim.cz/uploaded/files/faxalamanojoxid.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6fd61e1983d94bcf38f43cb255681fc3/34572658812.pdfIn PDF document text
    • http://land89.com/ckupload/files/8552907935.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/38141690519.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/03dqgclb1u7j5cgrvjrli5eae5/1836633513.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/suwudugejidobofofufalajef.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0adf3d2c---67369155025.pdfIn PDF document text
    • http://gtshotel.it/images/file/tokalolafigasapik.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121ba20598af---jedepugika.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/54560518479.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/48083019153.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5f1aaa2f---piwurewixikulabigagebidij.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c05a0c25f---munafiwipajufoxe.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/63182143681.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/18069114134.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fokaseruwewoj.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/widizifenaf.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/81889987424.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/64699c08f7a01dd54e0f19e8d488ab67/tatoredikizegajusogogizop.pdfIn PDF document text
    • http://hongdacable.com/d/files/79561909783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=heart+touching+broken+quotesPDF link annotation
    • 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_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 10932 bytes
SHA-256: b332fa7658d1e96028b99d42584cf7e8cc117e94516a876a6d581381b64ee676
font_01_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 16552 bytes
SHA-256: 1d48b5cd9538ab069ce0b97d321252045eb54d3742a04738f3fee9e0c26e94a9