Malicious PDF — malware analysis report

Static analysis result for SHA-256 674881c32d226cf5…

MALICIOUS

PDF

94.1 KB Created: 2021-07-05 00:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 35ae2b13bf0d475b9033cdd8d2ca65d4 SHA-1: 35fcfca2e8465ae221e37529a2ac6487d3c20f6e SHA-256: 674881c32d226cf527d9776334b9f7e5a9d3381ad6354abcca577cf7f3dc0354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://korean-school.hu/hangul/userfiles/file/tepovinojilobu.pdf In PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160846ec50085b---96186289781.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e85c0382c5---gonipuxizifavivusul.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/42453318621.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cqns15qttdsjb5ji2dbe7kv8n0/65823167659.pdfIn PDF document text
    • https://bloomeng.com/uploads/kuledonuzekutababumaw.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/12351737767.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/76051260296.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160801e3d8659a---pewinadalolapesebi.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/0806b37cfe52c06748f0f0102a6645cd/gadizatudon.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/5958480945.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c95d2b0c23---vaputurof.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/34181840998.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/64vlg80293bmpg0i1nl6uq4s94/28366870012.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/91c7d0c358556b6189ad8564b2b8e75d/wofibitezaxobazulawowigas.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/warojebodavawi.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/74705046444.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210619143648.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/genuv.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xixogevazox.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de616e09ad---43471366671.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/4807482328.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086a80768f52---73142294280.pdfIn PDF document text
    • http://poorclarescork.ie/images/43547624732.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728ae464aad---31285337029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dice+questions+for+ntpcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 10512 bytes
SHA-256: 4a3e108f4f904dd3ac330505cda29ab5ec1e3104c28b78ef7491f1c2fdd61caf
font_02_sfnt_off0001261a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261A 17436 bytes
SHA-256: a77c48aa694cb9a280b3f317e3e900d078264f595c0347dee1e98ef6b9e4b2a1
font_03_sfnt_off00015418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15418 16100 bytes
SHA-256: a5dc1b30dc3632a67f576452f4b43380586cc5790bd5c2412cd690764d881ec6