Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ef66594692f7c4…

MALICIOUS

PDF

93.9 KB Created: 2021-08-01 04:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc2d719b02822aa4e827cbfb76131c9d SHA-1: 6a983d6c44804003bb84f93620b3b4673020d24a SHA-256: f0ef66594692f7c40202233fba3bc5e0d93c9d3d9d785dacba0662ae97e312bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. The embedded JavaScript is a common technique for executing malicious code or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105dd176394f---fegosax.pdf In PDF document text
    • http://sdds.be/userfiles/file/7000971200.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/sevubeberijosewufidege.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/htcalutct8ma99p0bl67tr580v/68733302771.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0d32c8db025844693b2ee9903befca6a/motaburezewita.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97c8ebbab7---41501526294.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/gosasaxazimazabe.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/60034434152.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7pr7vfh57hstr8a6pduekrns57/fekisip.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c654de94c36---94403404557.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/39130266019.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/c06a2da87828e0fdf3ef92c9a4774b6e/vubijokuberewarizenipobo.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/81296004529.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/fabinafetudurejaked.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/15979828913.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/aa4e851714a2c02075d588ce2bbf4b2a/24465056849.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a40a1b802e---mulutikakuxuguli.pdfIn PDF document text
    • http://peeweeslearningcenter.org/clients/5/54/545fcf94abc6bccf175f3035c740e6d3/File/tatiwolomozukogebura.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0415672e5---degukepikixarobumo.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/pemebuzuguturitakefuruve.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/nudepitupaminawera.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/i0ft8sl69hjnsngcl3qjt0i8d1/5450396457.pdfIn PDF document text
    • http://soupworld.de/upload/file/22235435509.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/14841304032.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085979f1e96c---95815684499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=essay+on+coconut+tree+in+konkani+languagePDF 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_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 17008 bytes
SHA-256: 80e9d95a8d4a285cdb98fd4c9acefe553433f24f576e6cb942163f8d1efb774f
font_01_sfnt_off00013862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15079 10692 bytes
SHA-256: 5cff5b278708867b18e204c899c20ea9e723481cd0e7bc0ffb5d092d2e10a7c3