Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c4f3e60e8d0cea…

MALICIOUS

PDF

85.7 KB Created: 2021-08-01 07:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 97b9b166544617a68c49d04b441a5ace SHA-1: 1be5c183324f2ad3470c553d13eae1c099125605 SHA-256: e0c4f3e60e8d0cea8aa502fe58705be26e1356e3bf900ea9f38ef0eb10cc1098
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links and the high risk score indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://agendatourvietnam.com/hinhanh/file/56821008410.pdf In PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/nnchtrhmvfk8hm1t1eics7g3da/82716953944.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2af779998---gixuziko.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/a2jlhonstcboufoqbsqjp5njeg/tajizu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/zejogozoluxogekegibow.pdfIn PDF document text
    • http://thongthien.vn/upload/files/belesudebibebeket.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27bb82c3f7---zafedoxafudoburifimepel.pdfIn PDF document text
    • http://hnysft.com/d/files/45248110425.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c916cc0f9---vadezimi.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/28330577833.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/34292195182.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f3612f5aa31---13229231429.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210701063832836814wdxdbgfsv45f.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/79365982642.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/88446649824.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/nijixiruruzekifonagix.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/72377195619.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/g676b0mmqbv10755mhbudcqf30/foridujodexiso.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/51753030789.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e72e24b6aa---30995289646.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/fegisebojibabilume.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/wadugilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+reset+zesco+prepaid+meterPDF 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_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 16268 bytes
SHA-256: 6bf2ec675142e058dd7ea9a7ee74dfbef8e75baad6c5fd10a25ab2eb1943e9d9
font_01_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 10664 bytes
SHA-256: 40c19e64ad76879e0864a3aa5484917e08d034a3c577974808224a51a4311017

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