Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef20b2be80433bd…

MALICIOUS

PDF

90.9 KB Created: 2021-08-21 17:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b1354a73e4b389dece79c47d833f6fc SHA-1: a41679a7549384a3fd43bda8d0d7a0746281ed8d SHA-256: 6ef20b2be80433bdb435ee47930a14b35cc3141c3edcd31ee0b3bb0c9faaaab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=paginas+para+tener+diamantes+gratis+en+free+fire+2021 PDF link annotation
    • http://minhphucvietnam.com/uploads/userfiles/file/fanegumumusoleveler.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/86c4a06054c5a1876e56d6efa0da82e6/15628559129.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/66042241377.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/20502615933.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609865897b525---60519596515.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///99961334299.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/bozijives.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/36689673435.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e62c218cd6c9dfcb4c3cca358d0c9f90/28445198807.pdfIn PDF document text
    • https://menu2uplus.com/images/file/mibemipexut.pdfIn PDF document text
    • http://airfa.it/userfiles/file/95334232587.pdfIn PDF document text
    • http://sukhabalka.com/files/file/79831689950.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/91304711028.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/minotizejodigezosijedof.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/fukazexo.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/18700806627.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ga7cdh4vqeb68k7jgtsrabgcjv/45280332629.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611438d843c87---29397658572.pdfIn PDF document text
    • https://megashina24.ru/files/files/33065355332.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/52179588104.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/zesudejajosemoxagawobet.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ac961128dd56f9824b2eb5e1a6ef42a5/14568423404.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f82142501---74622303583.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/b6kis53hu2e7ab1h6b0pqc0fj4/1871051226.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1756d8ec2---zujaniwidozeber.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 18860 bytes
SHA-256: 7e9ce6538e6463f8c12c50813fbc0dea59f1f36bba9d8df74ef01206d03f5425
font_02_sfnt_off000128df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DF 10972 bytes
SHA-256: ee6811d27380c22888799bd128c76d8c21f5a859abf08c11ae89e62f33ec669a
font_03_sfnt_off00014234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14234 17032 bytes
SHA-256: 026d89ee8c5e7f86e0370b05058604f702d98701700e48c9204d6f53b24d475f

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