Malicious PDF — malware analysis report

Static analysis result for SHA-256 5832c9dadbb51db4…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 13:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f575ea96d77e6a7680e2a58a1670272a SHA-1: baac90baa5cf121dea97cb12c00b9ba5f7405d77 SHA-256: 5832c9dadbb51db42b1233660d555c77848d19310004d99d5247f1a54f1a89bf
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress installations or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and does not provide direct clues, but the overall structure and URL analysis point to a phishing or content-scraping attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://antonioruizabogados.es/userfiles/file/89215027062.pdf In PDF document text
    • http://eksan-ltd.com/userfiles/file/11356884792.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/sidefudunazima.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d6683c4e7---nirupelazubeloxawujewek.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ikuln4assgdl8nb5699ee2suoq/wilaximujesaxabokovuviki.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kuxoponatosipelowumij.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/02158514911255fb60869fc534e618ca/87867090281.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/65426104051.pdfIn PDF document text
    • http://minhanh.com/files/50581221707.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5fe7adc08a9804bc60b7eb98dbf12bef/43145590536.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/noxukitedibizulifide.pdfIn PDF document text
    • http://highdesertrent.com/newsite//images/uploads/file/92993108426.pdfIn PDF document text
    • http://liily.jp/upload/file/20210720072113.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/52604481459.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/judunukolawototiwevog.pdfIn PDF document text
    • http://envigest.cz/upload/file/23793594484.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/99826391990.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f56ef2af38d019eaf09a8c28116daa9e/32415600281.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/pekosa.pdfIn PDF document text
    • http://cmtsport.com/pliki/20379904251.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/39714383978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=learning+to+read+time+clock+worksheetsPDF 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_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 17872 bytes
SHA-256: b4ec41d13f1b0df9ab2331a6165b362d3894956b0d569441437932bf93196d39
font_01_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 10952 bytes
SHA-256: 18b50d6e9f8525302db0cdecdfeead764bd940f928f519a75c206b2f2f96e03c
font_02_sfnt_off0001355e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1