Malicious PDF — malware analysis report

Static analysis result for SHA-256 76afb459dc30cc5d…

MALICIOUS

PDF

90.7 KB Created: 2021-08-31 04:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1055a9977a347b36a6ab389cec7a136 SHA-1: 83df77c5518a80894350ecc05c9f749c8b47d85c SHA-256: 76afb459dc30cc5df2e3664fc665a26d1ed3a5b7d17bad27e6499aa0a7327927
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs suggest the primary goal is to redirect users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/fc4a837a4892858682910625473e28ed/xuxuzabetopa.pdf In PDF document text
    • http://sapaelitehotel.com/webroot/img/files/guwidaranavabapekaxezi.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/hi5fdbi2n5nbcqmss8ksrjd145/97650247874.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16234923556395.pdfIn PDF document text
    • http://abc-tel.ru/data/File/govowa.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/74484659945.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/gajenibon.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899982eb755---ruroxekibefinixikimiloje.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/letomeveta.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/qh4gvc4epaeeb1nt8m85jgda9b/20243079383.pdfIn PDF document text
    • https://avenue102.com/uploads/file/8805388368.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf0de04ae7---52508521229.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86b42dc74---6573547604.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5qk9uhqs6gb0ivaoi29ho9kgg4/kawiw.pdfIn PDF document text
    • http://agama-rc.com/upload/files/16227138872.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/9370883364.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zemumabiguwomatusavokan.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/15825734830.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9fb22132f---73688001282.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/mazanakajubasoluri.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/regepobuz.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161195204234eb---77360377625.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7a55b88fb356b74123378708098bf4ef/giromezo.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/68646519591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ome+random+chatPDF 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_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 18676 bytes
SHA-256: 130c26252f28763c0cc9bb2b54064ac9f2ad03e5ad79acb44f09baaacced01f0
font_01_sfnt_off00012de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FA 10352 bytes
SHA-256: 4a3cff174cd512b4dbc791fe780bf8d64c1614d786618471200c28b007ef7f5e