Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b63c47deb435186…

MALICIOUS

PDF

82.3 KB Created: 2021-08-27 09:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 642d220805db9b798fb88d21f8084fb5 SHA-1: 08ce59341db931e8afe3f2768fae325049bbc540 SHA-256: 2b63c47deb4351864eb7fe23554b97bbf014aa1e7917e38c33e95f660b08a8e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611e2d6a5b117---28020059342.pdf In PDF document text
    • http://beastyenergy.com/userfiles/file/19875545472.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160871b5005163---86625749853.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/xuzakexalosalenij.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/3gte66f30halg8nl07psjtaq10/20512192134.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7c2cb77922634419d110b0faf007f0dc/momapep.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a96839491---raregurupabik.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/fa0cb85654de814fd00bf4aed13b8a4b/feropovogovemakexobanafak.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/66671743249.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/85073093420.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/jamuroxawaxawe.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/17584391613.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/55f673e44710c33cad46a90daedaacd8/tisajebi.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/mirazonadawaku.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/b2ph694njvbmn8ballq1qgl87n/74770964867.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c97a27bbc9---49042284680.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/zuzusolavovaxedavotefufod.pdfIn PDF document text
    • http://teifsepahan.com/files/file/fewojosemelorewovujujo.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/75751641163.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/jelabepulasidupasebofo.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/31290076671.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/qaaq7fqgkn9mjjg13kcbvhqkhg/92585406690.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/9288007038.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/5071979779.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1b90f0dbe2e8874f1e7689353ee46854/zanetuwiridoma.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/pizifabasanodetejifavoful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+customize+your+discord+serverPDF 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_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 16760 bytes
SHA-256: c5df5e35b86fb7713cac7627d8dc904bb8d15f686f3400780647ec6e8333b56c
font_01_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 10636 bytes
SHA-256: cca23a79c58b0ceadf1027d87dba3f38a9f476b64b727cc4e68127b51a034e2f