Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee6f8a743dc55e76…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 06:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f2772cecf5c6a54d1f7b6005a884e4d9 SHA-1: 95612e91b21587167bec16ded0adf7b806efb4f0 SHA-256: ee6f8a743dc55e7639acd1857a3826c6c1195f304e5e9e26d458b950f5aad31e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to lure users into downloading further malicious content.

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://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/0f29750be2b8883fbb8682932ba00def/roxudanuvoxuliwe.pdf In PDF document text
    • http://german-ex.com/97026802955.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/50440418899.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/26686007060.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/lotuvigulubokadazeli.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/komujurukokepexazerej.pdfIn PDF document text
    • http://stattus.com/assets/file/93118308280.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b8f7e45b---dulukoxamaxirapu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d480837b94e---foxesugarobatarim.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dec313f08---dojujepofivewarem.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ske886jherg8s34c0hsu6doe6c/66163992927.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/be8da9630f9cff7e1235752dd86329ac/gusijezogikun.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/fusigefediburelive.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ee8da1360---newofowamin.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/puvujafidi.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/2136544231.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/36193854322.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5f1l0osuu9k363cn3ec2uqppn2/nedazelewazo.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/43513491457.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078d5be33f07---23026651308.pdfIn PDF document text
    • http://cjatkinson.com/userimages/70689795256.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/20514147153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mots+fl%C3%A9ch%C3%A9s+20+min+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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 20332 bytes
SHA-256: 3606f434d033df885603073bd9cbf0d9284b3e4ccfbc83beed4418da7f80af36
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001236e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236E 10880 bytes
SHA-256: eca197c049cf00b79a4ec40979c36678784b51b2c4a29b7b287607de590c10ad

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