Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55f8ea8dc01af69…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 13:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c4a8ef0ef6876d062d218eeac83b974 SHA-1: a96559930a1ae9d86439d265ee90171fad32f58e SHA-256: d55f8ea8dc01af695781e498ff7edf0f88a20d1dad8fc47aa9213f6c9ee6bfaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://advik.net/userfiles/file/1991939952.pdf In PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/wanesak.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/b8ah69pjo100nve3nc36nuhl1i/feliwutemibilamufe.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lonasanaxeninonepix.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/96246962587.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/jezubakoge.pdfIn PDF document text
    • http://atiksigorta.com/files/95914623785.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/42489721544.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606d612c55c93---nalirupef.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/96988089904.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/84968236832.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/detuwadobibijalewivumufa.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f39d5f38b59---62320556842.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1fceaecee0ae4a67ba857d7454c5b4dd/63270544536.pdfIn PDF document text
    • https://schmitz.cz/res/file/86427800606.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1aea2e527b4d73a26290cf39f7d09438/73715590861.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/dopolizalafu.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/32e0fa3c9f7e12c4e67f7ab4af54aa5c/73239911093.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9fdad944---nixowo.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/desefexujimurejom.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160fb09e0eba5d---zavasegitosugokep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=an+inspector+calls+revision+workbook+pdfPDF 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_off0000c00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00F 17544 bytes
SHA-256: dfacf15c6ea270e2448114c165d2d53dd486ff1221f4e5e4f2016d3ef855b97c
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 10980 bytes
SHA-256: f9ff6973938429e6b953119a05eba0208a3065da68db3447e0edfe105a59524c
font_02_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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