Malicious PDF — malware analysis report

Static analysis result for SHA-256 6405850e8fdf0c70…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 16:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a43915d902f3b51ab0aabe12a18aa67 SHA-1: 06374b884566d14b3dca1f9916d61439683b5ecc SHA-256: 6405850e8fdf0c700ef6e7b4a44f373d685649d5997e36f5a2cf1d7fc23f11ca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

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://almoheetmanpower.com/public_html/userfiles/file/nenefezonajumefelepilol.pdf In PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/ruzowiw.pdfIn PDF document text
    • http://eternaseguros.net/files/files/33585033509.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/52892012939.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/bosajuvawikomevom.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/68126118053.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f4d86e1335ea18e1f41b5a85f28575f8/8643151598.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/jefatibosisujew.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/pegodadilobafidafuz.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/81248347942.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7b3a81660---21406165428.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/xopoz.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/48386735176.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///ripomagitivepibinuw.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/29245537624.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/81640156271.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/57328643948.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e79964fc43d296618a139fe96a21e5ad/85831500943.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/83278578810.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/zilizavatefotivofetixo.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/pomemuwozoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=legally+blonde+watch+onlinePDF 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_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 10676 bytes
SHA-256: 18cc506fd29cfd5271acc3dbc092e42af8fe040d0041f8f1e7403b11ac6ab8ce
font_02_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 17872 bytes
SHA-256: a169dc089de0669dff6ec3cb555bb0c273089d088e1cd89967284c21a3f3f574