Malicious PDF — malware analysis report

Static analysis result for SHA-256 64566d57a2d54ac4…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 01:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3080c1ba167b408d7e304c295fe0026 SHA-1: 96aa4b57a8efe4b240406327e9292ccd78a2c2f8 SHA-256: 64566d57a2d54ac437d3d361b5df53da4d4147fd15e8707389d5f0ec8d303802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to compromised WordPress upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The primary attack pattern involves luring users to external, potentially malicious, websites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://haenuri.net/ckupload/files/42402228741.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/cmaup2hh3mttlluvpi948ane51/gupifilom.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/p0b83tp0ltbq4vn2it6p6f4c23/watifex.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/38909857517.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75123603678.pdfIn PDF document text
    • http://zatacorp.com/upload/files/wapados.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/67222207260.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/41501611660.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f28ffe18bb6---duzesorofamidigonuvip.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b803a7a53a2---peborigivilujitekiwufolar.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fuifbgack2kkclr98smr0hjmn3/74315940907.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/sexunobegofafe.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6418e04ebc9f4fe711370f320878999a/bixemojexugapudesofal.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6cc3b301f08f62a6871adea077c2c6bf/mojeburek.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/59703523331.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/43454851094.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b285c3e1---77598705984.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/44440924824.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/37177306106.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a01a1ffef94a9a456fa1d572758ac968/21000168812.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99080a81ff---84324254570.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/3393477272.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/madazuxugat.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9fbd8b1cbe82265d51b331c8ce776374/jiwupipuvibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=woodworking+lathe+machine+pdfPDF 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_off0000c43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43F 15884 bytes
SHA-256: 9ba4d814734bac7b39471e1f54eb4c9311e151b65f668da04f6ca6cbe5132279
font_01_sfnt_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 11072 bytes
SHA-256: 9e1de4e62c53639275665ade197892d888a591b9855d45140806e13cfc45db97