Malicious PDF — malware analysis report

Static analysis result for SHA-256 532146d73cb4e4e9…

MALICIOUS

PDF

91.2 KB Created: 2021-06-10 07:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3d0030053ba977fcb6a696fc397ff9a2 SHA-1: d4ff8a4a5122fe3a218e0b13a2777fdafa6fc68d SHA-256: 532146d73cb4e4e993682a03308f1d745e6f99f5bd3722405d3578370673de89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to potentially compromised WordPress sites and 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. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=french+mixed+tenses+exercises+pdf PDF link annotation
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096680f3d29d---mofazivesones.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dd4f49381---posepidemilurixugutanitos.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/45634789911.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/masutopawunikovefu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082c18c62e53---83250618544.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/adj44gt69lac8mhv4u89e145kg/82221799466.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/lusewaturazapegivikepen.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5g6nb4abtugjtae93p00bhucli/55636821362.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/rejugizasanirew.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088cca7cccb9---69642836911.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/9497piojjlfa6c71pqi32t1t27/xawev.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1b72c360d---luwofoxedawegufivakalodu.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/tiwixuturiju.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98912fd96---76428741341.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/givilovirupokef.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5bebf23b2099f1bb05994e6812cb6258/jisogora.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/wedev.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/zadimasa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12734 5176 bytes
SHA-256: ee66f6da516bf1809df5d20452c78e187768a28b1457d69af481fbb1a5c13f10
font_01_sfnt_off000138ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AD 12376 bytes
SHA-256: 0ad541e4bec12acb2cccf843d367b871ae24ee2c6a5ab54c25d8ff6cf7d8cfef