Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae92be9c3e9d666a…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 14:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1e90e6790c196f3b30c2f03ca2cd319f SHA-1: 33ed067cf0bf10bd6acaad9ed2830293cb4d4219 SHA-256: ae92be9c3e9d666a56340023074fdadb1c6507348836cc946858611e778d2178
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pixomot.ru/uplcv?utm_term=existe+una+papelera+de+reciclaje+en+android PDF link annotation
    • http://origo.ws/userfiles/file/76558393159.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/91190278891.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/juxekavibusileko.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/89750636928.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613232a7074ec---35362748307.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/11818833939.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161330e82f07f9---fikavulexim.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/19507529083.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/25742823259.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kbg3bjmh3h1lbd1c5pe3o6sr60/15652093169.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/sesuwovuvaruf.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130db69da450---93502845282.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/kerot.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090945518_120664922.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/70166649729.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/xunivomidametotezu.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/53120817493.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e949b751e---nudasinurujusirujawisewe.pdfIn PDF document text
    • https://pisausakti.com/contents/files/9037719750.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/93722181847.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/13859181392.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/botadakipelipimovixanizev.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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 19860 bytes
SHA-256: d6a26432c02eb839024c9b2d5858af502b4ed07f8e42b28af44343c095201668
font_01_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 10824 bytes
SHA-256: 5c313724a78232c8b1df7d8b5b336cac330897309ba8de881cd96aca3140d082
font_02_sfnt_off000137ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1