Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e8406808d331dc…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 02:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ac0f6d770e853ffa132692c721570f59 SHA-1: 9cbe7d790c2a137a8f897a1fb0e4d98f03c45ee8 SHA-256: d4e8406808d331dc34c49cbcf82677ae79475720c396b698ba15eb3792060a48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised websites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=american+journal+of+infection+control PDF link annotation
    • http://status-go.net/gfx/userfiles/files/waramuzebil.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16078ec8080144---jitixojogoregikiz.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1d753c594---83668836254.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c968c2c63407ba6cc7b664b199c98a44/9663920586.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/gabadarivima.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/15103865543.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/wuvotujakobexo.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210619162410686628.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51227545d3---riwaxevadeg.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f2181acf5---87265855262.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e205d8efe---42410169831.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/33097599241.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/kapevifir.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/zuvizivuji.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3a20715691080a6574868cf523dfaecd/bonulokitevalinoxapa.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609871a65760f---87113051832.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/60849671644.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/kokimaniwujisebilo.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/85695636312.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0766ebbb93---21361320548.pdfIn PDF document text
    • http://temple.mo/userfiles/file/xilexafivel.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/49815877233.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_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 17988 bytes
SHA-256: ded01247eec2ff2806312b9e53e4604513595249c588a779b2c613d254c674c0
font_01_sfnt_off00013251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 10540 bytes
SHA-256: 3ed5cd0b7ef8748d8d04d27812cfe6e81dbfca710b6708aaa888b68466faaed4
font_02_sfnt_off00014a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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