Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a7a8aa3c9f3f75…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 23:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b68426db4838508bf8de611d8e1d94b4 SHA-1: 3a05824b368eab433b87bb183f448a08f47956ca SHA-256: d1a7a8aa3c9f3f75b28d290ccd54e0e518c59eeeb1e3644d52900d8ac879e247
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it's likely a phishing or malware distribution lure. The document contains numerous external URIs and links to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=prueba+pericial+pdf+peru PDF link annotation
    • http://villa-margherita.biz/userfiles/files/21617094362.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/37378361449.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/tumozilenebasekedijusuk.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/gevikevizexo.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2c3977d8a5d2be48daaa06996114bd97/luxifev.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/9843950080.pdfIn PDF document text
    • http://ocean-ex.com/images/blog//file/11527267295.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b48fb9f65---vejipiwudurafa.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/f683c32a4c41161c249781368759c6e5/forixi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/091e43898a532e3f93df249e519acecb/79623715509.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/guxamekuxesun.pdfIn PDF document text
    • http://pinetreerealty.ca/clients/55933/File/8575088481.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/44885eaa1dba05cccb6741bb5f9d6737/dezetokefemako.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/87c96c8db1fc9f47d45556e6e7070645/dupaju.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/wisedoleji.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c60f2df3e9dfc35ac44b1735b2432f2a/61521835715.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/loxaxasinetudafikukonalu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59798aaea---48042147743.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/vibugoweze.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b215ce66e65---45997146330.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/fufarapafop.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/garaxomosigemubopezase.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e098d40fe---batumezuzixaropemaperew.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/581cce5eec175c75aef99fb1717e01bb/24797765137.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/28078997542.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_off0000cde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE6 16936 bytes
SHA-256: 8b26cbd2e425e0408e59d4961aa16f032db987b92f417187e9db4de2f5f18de3
font_01_sfnt_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 10364 bytes
SHA-256: 64ea6eb094abb13aef0a12877eab3e247bc9136052983a496d389154e7b4a96c

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