Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fda628b648e341…

MALICIOUS

PDF

81.1 KB Created: 2021-06-12 19:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f936f0ed7212af7bdb619a02ed98d39a SHA-1: 32a0f6bfae845dcbeb15cfb5629159e42f2312a0 SHA-256: 84fda628b648e341fb7900aec2ee3bc5648d9fc394e3e7ecac14e3fa93e0fe0a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=can+shih+tzu+eat+spinach PDF link annotation
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba2a64191---98454700804.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609210ff601ac---63914470888.pdfIn PDF document text
    • http://funperm.ru/content/file/lasapaminipevubovava.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f540ec68bb---61594919548.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/nepimigirobatidu.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/6759219859.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e44590c5c---17171552533.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/46af446a872f21177445c0e181cdb2d5/gidejigozimexirajuvu.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/89462112509.pdfIn PDF document text
    • https://aashianarealty.com/file/51838099400.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071da12af814---lozopasafedemakifamumun.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/da6063d13f99df77bf8de7fe9c422aa7/25546194519.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/9573ebadf53120c91d10f3324dfb8bfb/tifonidixiwirosi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee867957d---jaduzefukojosasiza.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/60341707684.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/15929937806.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/xavalitav.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dd39d3cc8b---rezafukovodalak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 4848 bytes
SHA-256: ae52aeae19501cc68de4aa8c6321ea69bca4bf2c6f179a077663c6894420b00f
font_01_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 11044 bytes
SHA-256: fec17581283bfd26a9d8402d61ff4075e510a597b807bdd7078e2830374b30c9