Malicious PDF — malware analysis report

Static analysis result for SHA-256 880c57dd790f72e6…

MALICIOUS

PDF

87.5 KB Created: 2021-07-21 08:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 21a1e77719940f0c33c2d9ae0eee2a1c SHA-1: 63e38a66d7adf9550a52d39c5c829c2338ccb531 SHA-256: 880c57dd790f72e6486e3d86524e860d8a97dc953d93e7cf6653edd85c8df5d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics and ClamAV, indicating it's a phishing or trojan PDF. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072189ddd2ba---femakabogug.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/par8eo1jvgah1l2sscdc7pcgo7/jomabikimawexatagexowe.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/4488609743.pdfIn PDF document text
    • https://baptistfriends.org/media/5771967588.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607388351bd5f---75732761992.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/2s1cgqb3ur9k6g4fp521buv6ft/koxosejitovalu.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/78094396084.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/87383753932.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095285ba81ed---powajekadov.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a953eb14---35396773420.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2c819fc---95488717573.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ebafb9c150f12f9cc6e700d266a436ff/jokozowa.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751971eafe9---67194811181.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/kigusudodor.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/e2e5e4f9f196d582fc515fa4aeb419b9/53656759081.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f37d2836---jogimamen.pdfIn PDF document text
    • http://dzbnf.com/upload/file///68300411623.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/pupefusakavodiw.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e57a40d7c7a---41679475357.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/dutetunaramixo.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/8bqev4pkn9dut08afn74q866jo/vawipulisutoku.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609122457b34e---57972272182.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f557d114bc5b911757b96d0291b93d5a/54070450446.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/jewigisolu.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/30r9m1p67kvesr82i7krvolu65/dekepi.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/panafujesebubug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=browse+surgery+6th+edition+pdf+free+downloadPDF 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_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 11296 bytes
SHA-256: b57ccd8613df4a7ac104f3fef3ecd43b91b8143fb7a941501edb20a63cc9ef2c
font_01_sfnt_off00010d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D41 16524 bytes
SHA-256: 784c656c59cabdc4e6633fbccd3b7c7803eab86da9deb5f095703c34f620d477
font_02_sfnt_off00013831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1