Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d4e4cc5da07cc1…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 03:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd0178350bdded5cb7fddbe437b8d720 SHA-1: 4ebf5c87005dc78d8ab4a8c7df547f9a5e6e480b SHA-256: d8d4e4cc5da07cc17d87955a1e07186f5a73325a638a3d64471365170bfff153
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of common phishing and malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=windows+8.1+product+key+32+bit+2020 PDF link annotation
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/20574584709.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/81240485748.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/62248103794.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/koxisopemasij.pdfIn PDF document text
    • https://nistd.in/userfiles/file/1552800319.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jimove.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/dikaxiresabozifipudivogat.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8b56232fc---welobobiluviwobikonesu.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/38696536279.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/zogigo.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/jowaxekuwiwi.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/10052168472.pdfIn PDF document text
    • http://suamayphotocopy.net/userfiles/file/43298790349.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/niselupumisorimegawim.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614037e8c2eed---39186061756.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145c5d3028fb---wesotuvaputo.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xijawaxewizuxa.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302fb1b5a0e---56242901322.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161516a9e468c1---gokuguriwoloxe.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/fesuzetivejakikugebopakap.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/xagitej.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/muwesugideroni.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/tifoziva.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_off0000af5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 15356 bytes
SHA-256: 94b15a677a22459099fc6f3fd225c0dca33e020e0e8c5205a0c622f104e88c7c
font_02_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 11564 bytes
SHA-256: 25802bc16b071754845a746079772617723613b7d15b957b8bdb2439ef4857ac

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