Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acb7c8da5f21363…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 19:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 901b0d0b0f05ec816a5554e11cf0f595 SHA-1: 0cc23d538277ed63a9772f60087728715eb6f123 SHA-256: 7acb7c8da5f21363a4994a03ff6ba02144b751b4a83ca384f818d13fd334d622
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=traitement+des+eaux+us%C3%A9es+domestiques+pdf PDF link annotation
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/71398101174.pdfIn PDF document text
    • https://vontobel.shopbyeberli.ch/userfiles/files/xazuvanelavuzedaw.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/kopegipozope.pdfIn PDF document text
    • https://unosms.us/userfiles/file/vifutus.pdfIn PDF document text
    • https://ccskin.com/geektic/files/24051122045.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/61492811857.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/p57gnjpg2r81708cg5tk71ctc4/kuropemilusudalitof.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/55bbf57748b71d9c7724a2ebce2bd69c/kanegeju.pdfIn PDF document text
    • http://mextro.de/upload/files/91709399773.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/1tuvs7g1gd87hr65jop7as5691/13631221823.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/35408260185.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dce8177f3---37886593663.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/34383370561.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/22966088369.pdfIn PDF document text
    • https://ocw.tw/uploads/files/56054715291.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16100e4b6a3ef5---64619239145.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/i49s5h21dgm0ff5hpfti20ae9u/83879055576.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/61321000135.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0001637280a5f68b0acf8cbcd94c157d/12439879063.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608079fc64d75---pesifadutu.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/narofuzakawo.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/77769655481.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610c3384ec9f8---fugorogakepivufovuxa.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_off0000cfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 19636 bytes
SHA-256: 68b4bb81678399d01b32f95c586a911345311339f44f50f01d25cf7a4ec5dc68
font_02_sfnt_off000118da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DA 11076 bytes
SHA-256: 6ff48e8ff97337b7385461be7de1bef987db4bc4777b98e9c11b021be7cbf10d

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