Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e534ae89f789d2…

MALICIOUS

PDF

87.5 KB Created: 2021-07-26 08:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7e28f5e67a1c0fc47a7feb8a64b3d1a0 SHA-1: 669e06b81b4f0df94c229647d95e254084f3c961 SHA-256: 72e534ae89f789d2bc0fb8250887884c5649de9c7c0561619b25d2de9436d16a
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 and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160790d626875b---89680677397.pdf In PDF document text
    • http://tecnoservizi.com/userfiles/files/zopizobekolivejilevum.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/234ec885cfcdb6cdb1bb620cd3db172c/6846305724.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/lefivubip.pdfIn PDF document text
    • http://coffee33.ru/archive/file/tiwetikozixonuwariwimiwox.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/19896896670.pdfIn PDF document text
    • http://coumert.com/images/file/zijadolesanofememekutida.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/l25jfkri4g5971ngrfdn93gth2/58091795033.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/wiluxaxerurimupezil.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/73245481331.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/nitifu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160943effa7776---gupasopub.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/906426d963e1a8dd84b81c3630a92f6c/93814720854.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/nuzil.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/jadulewujuvanitaf.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5bu0p1boemlci8h6gmg576r41k/30488315134.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c68602b8be4---3892082005.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/79863488692.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1877e276---zafowusesutujazegeril.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b222fb841f---75024656762.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731b9f4601b---47252690580.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210717163536.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/43322298349.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5af3ee3fc1---lafejapevizimubiv.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b421cfca1---46719064548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+replace+the+drain+hose+on+a+kenmore+washing+machinePDF 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_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 16436 bytes
SHA-256: 9a43b636ff54d6c148ad66ec850bfad50b3865d43c61e236d7c530faa121f004
font_01_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 11132 bytes
SHA-256: 9d04765ac480fdc697613bbd29bbeb42efd8fe191f34bde0c92b44f16b0f7bec
font_02_sfnt_off0001365d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1