Malicious PDF — malware analysis report

Static analysis result for SHA-256 61448cce84d26be8…

MALICIOUS

PDF

90.6 KB Created: 2021-08-17 02:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b58124958c768d8c7113391a6b8f1376 SHA-1: 1cdf86b34b5baa73dccf60869ca534c6abd62031 SHA-256: 61448cce84d26be87a16c86e27a550356fd61486439212151ffaeb2d02e34429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious content. The PDF structure and embedded links suggest it is part of a link farm designed to redirect users to phishing or malware download sites, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the presence of external URIs and compromised CMS upload links indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://crewmak.ru/uplcv?utm_term=why+did+newt+have+to+die+in+the+maze+runner PDF link annotation
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7af9f95885592aee79c7642c5b1b65e6/98609725701.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/fuxevufanu.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/80820972459.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/vimokimawiv.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/65219034709.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/jadalejegoni.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/50997886477.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/dec7f675ed0c086d6603fd5229ecc051/xuluwizusetiniwimuxeduda.pdfIn PDF document text
    • http://tetedebois.it/admin/file/44787970634.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0e1k3p9lhtgfvfsj62aicaa486/91610402490.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210624143650.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4efe3cfe9---13146097697.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/92182002850.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/tamunajuki.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/87600972381.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/93342920195.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f7615852282e9cca39720cc6ef40c66a/10294679826.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/2kibo8chvb9bqv8cetva36p7pn/22400702907.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/78004513447.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771cc363df9---66099094953.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc650ac16b---radatuwatufaxoje.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/63cc12b2a090f6cdeb04fdaf289de32c/mewemore.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/20905309052.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b5b5e62ef8cecb3d663cc6cfe06fc38b/xigakiribuwabamifi.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_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 17848 bytes
SHA-256: 3a7bb16d33b6f7574d72e70733176cd76fc3686e3fbf007b9e66f7abbde2a43f
font_01_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 10720 bytes
SHA-256: 7615d8819d3c224ce2c808f4c83a534d8b727ed3c879d02da0fc28c091d64ade
font_02_sfnt_off00014360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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