Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6528bc68ccdf5d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 09:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46d64be47f580ec18eea213dfa6408e6 SHA-1: e1bdc47a82a5689419cc6d0ae7cad532ca41672c SHA-256: fa6528bc68ccdf5df12d19f7c2ef37fa3b2aa38ba9a16f79397d8ffdb6701362
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The PDF's structure and the presence of link farms indicate an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=reflex+klystron+oscillator+pdf PDF link annotation
    • https://makojudo.pl/zdjecia/fck/file/7577794002.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/19668292252.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966ed73d322---zopuga.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/pujemewupitep.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/caf3b204ab2026429a951b5f70e5461a/jumab.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/74513801314.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0753dc902a---21261225171.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/jugimeda.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/23590101628.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/33109533158.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/xemenunasidufalov.pdfIn PDF document text
    • https://amblamy.ee/upload/file/21877204761.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/38858027378.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/39542760876.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fe4630a69b37fd503999f32526d0bb21/kabovokijowukadifamig.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/077a1588cca722f1c59b21651d77d974/xarejerapixuxuwebaju.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/jusoris.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160adaef843c13---tezisexawak.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/4b30dc86a564e3bdc58adfcb1090d5a2/13761991091.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ca22a9b15f36842cd842d0aa8e97123b/moxapakifafunorujome.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/3657844689.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/90784779623.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/voom86a5gk1q2fokejnbclnre1/66274874451.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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 18352 bytes
SHA-256: 8471e692be0262b6f7892cc7881e425fc7da796f4c932d5337491c0e6d65c6fe
font_01_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 10964 bytes
SHA-256: 26615b6e895e4cc4b58bf35d27cfe2bae6695a14c358fb02b354719e889816f2
font_02_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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