Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d363ee0c9961f5…

MALICIOUS

PDF

82.8 KB Created: 2021-08-15 19:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a344cfe86cc7e3608e3c4f8509a505dd SHA-1: c0221cd0c8383d167ec717d1cf7d0a9bce876ff4 SHA-256: 28d363ee0c9961f5f403706984c83347398fc85a2ce7462d6a2c7bd1043f0237
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=how+to+cheat+in+fallout+shelter PDF link annotation
    • http://saatgaamkansarasamaj.com/admin/uploads/files/tegavexogase.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160728b72430fe---xekekivo.pdfIn PDF document text
    • http://jarosi.hu/files/file/zisuvemo.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/11874283725.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/89666273797.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/91097468078.pdfIn PDF document text
    • https://led7.ru/file/fezatupebopegeb.pdfIn PDF document text
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/52387305878.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/53eb88e46d7a84d16c998ecdadf5e845/72481098240.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/43278098675.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/513375b9587ecee22f3d1b76f93c5c86/85372465119.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608790504847d---69453829468.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/dqc7nn3bikan6j44e7imgo3arb/17114944503.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/98351542353.pdfIn PDF document text
    • http://3q1p.com/upload/file/210730084911268219talongw1gj7k.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb1c6ca7db---27926267975.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/lutilat.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a443c9b94f---71020034300.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/66674440803.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/64099007974.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/84194221906.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/38477960586.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/30eaaae46e430f8d96c7ed0cb6537273/74812970893.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/60501216888.pdfIn 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://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_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 16448 bytes
SHA-256: d4472fdb592ecf4f3c6e87c492ac571879f2205b0c5e8a8173af8c7e5663901f
font_02_sfnt_off00012557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 10608 bytes
SHA-256: a7549f4dc82c9ea3bb8e6d7b9e94a07f9aaa1e8814427d49723a76d5ad090e63

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