Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef51bd6e4336199…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 13:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c925346aa5b84cb964d7891ea04f47f8 SHA-1: f60e4b5b310cca46923f9112c6a117da75ac99ec SHA-256: fef51bd6e4336199509dd752ad599b3f2dfbd4f2c6c83ace74bf63d3c1327a9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/n3st5bij7ukpvo6leo3b82905d/33976026185.pdf In PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607720c7910e1---gejenoso.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/foxafuxurozunutuvabex.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b0dc7ede---jadalojirirapig.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c0c4a0b3---440953677.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/42861905126.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9e6074eb91050f7b30296048d68ca212/divikojizabaxuxomajalalob.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/lubezunitedevizazifex.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/zavukaw.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ebdac0aedb117ed99d02b81c2b0762ea/20335569175.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/pifelelurowelapinudiravaj.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/xapazopadi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d62497a39---davemeresadizavuf.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ac11f3e4dc5b16ce325ed302de5c665d/kijejanutazuxamumapiji.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/43746921272.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/95326432799.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/8c07f8a67743cdb589b7d13161fab730/jurevapinov.pdfIn PDF document text
    • https://businesslife.com/content/files/11126569674.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a443b866982---86027303760.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/69769631748.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/tufupufubitin.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/91069802190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=delhi+metro+pink+line+route+map+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_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 10788 bytes
SHA-256: 6247b001821769012a592c4b9274423e55a396d08ae08c077bfdb3001c35d3a6
font_02_sfnt_off00011c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 18680 bytes
SHA-256: e4ecb4c7341e525b4772c568cd7e354c594b9f8165d4c260f4c444325b8e3285