Malicious PDF — malware analysis report

Static analysis result for SHA-256 89538be9b156e175…

MALICIOUS

PDF

90.5 KB Created: 2021-09-01 16:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdbf6234f2df736ac3de90f5a48fc15e SHA-1: b08aec6978b2a266812f05a6d30745656d255e57 SHA-256: 89538be9b156e175eee35d019a45a5610f0639f750c54b0ddfd3bdd8f38a34c1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics are consistent with attempts to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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
  • 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://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6282b6b489fae9017137599e4b8661ac/medifebotifonewosokoba.pdf In PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/78793872505.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/64de327e13aea1a101d458c3b07aa61c/78658739207.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4cei44oqcd0t05cikf5dgle0q9/49465618674.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/fe24d1c1abad7caff4019e1eeb2e66c5/9142518233.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/lbfe8qucml5jbttjsnvbc4eggk/49521275128.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/52b31311cba02e2a3949cd1edec0f128/9964542809.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/54b67c9b0b46674e0a197e6256c03589/rudonakim.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/kufoxuwibidojirasad.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wifubetitij.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/73036751406.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/11887272661.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d064afb414c---tamowipolezenodowevoxe.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/zutetikerudusedu.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/12750088613.pdfIn PDF document text
    • https://geniodelweb.com/file/79547678306.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/10094362182.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e8c2301ec5b478df7c16bbcbf2c1a956/masixolalaxamupi.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/rudoginudamuxax.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100d9dbd0b7b---nizajokato.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202108250138373535.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/99619276844.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f711a1511c2---92936402123.pdfIn PDF document text
    • http://levotst.com/uploads/files/57986741931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=weary+in+tagalogPDF 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_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C94 10220 bytes
SHA-256: 15544c76a1c9ce1ee2e8e9c5cde6b8b62f253a94facad7be460453eb08fd8e06
font_02_sfnt_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 20528 bytes
SHA-256: b9c9bc71fa9f28d3fd645ea7cac7ad9cba5f37afc86b37fa884fa45e705a5e76

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