Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a9f6dfa1f78dad…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 15:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6809550d6d1ea9d03d6af651eee1a21d SHA-1: bd08e596c079d43c20e50527659b754407305cf6 SHA-256: 66a9f6dfa1f78dadcd056f0ee17bf18e63e151e950721a5ce5e0b3840f17039e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. The document functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting, suggesting an attempt to distribute or redirect to malicious payloads. The primary attack pattern observed is the use of a PDF as an attachment in a phishing attempt, leading to the exploitation of client execution vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://elazentrale.de/images/uploaded/file/pozumigudewevul.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161143ec1e23f4---82308607399.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210828021503_brpifo.pdfIn PDF document text
    • http://master-vin.ru/files/file/62955412016.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/tovofejeviworapur.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/vezedupo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/92383306480.pdfIn PDF document text
    • http://brlairport.com/images/file/97872818340.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/vopaneka.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/14132568902.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/80614422902.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607700485dae3---rimorodupu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/ripuvegas.pdfIn PDF document text
    • http://imi.vc/upload/files/jadirawudan.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/46c5a81c514311d5888d4bd3c6f879af/19829615982.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/mawojoxifibu.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/73270928839.pdfIn PDF document text
    • http://njchemland.com/upload/files/30331392184.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/rubeldt45gerpnbj3c4ok8qu95/fovotowapepekuxum.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/621b597fd15eab59a8cc1a423908be96/bakaxuz.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea8cda40e---15519855340.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f27077424---zovosuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=livro+terapia+cognitiva+comportamental+teoria+e+pratica+pdfPDF 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_off0000d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 19492 bytes
SHA-256: bee7417aa673821850b686d118a86618534a505d853585827cca22f8dfa1f936
font_02_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 10820 bytes
SHA-256: 128b92823d2f6e63c7ea71eb4d8826e3db1519067d3f01750dd9890e19309843

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