Malicious PDF — malware analysis report

Static analysis result for SHA-256 376a108d259c476a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 20:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9a6125dcf360240b90e417ea178b565 SHA-1: 491ea6c8c2c6df349f76a50f9bb7eabed7f6e0d0 SHA-256: 376a108d259c476ac3c1f57d788eb57cbc2a8b206d8a2030ed6668f6f29eb85b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to domains identified as potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://webhenevents.com/clients/868374/File/dimijuzelotipo.pdf In PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47281e2ca7---78054449931.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/zewinenureriwegiriguberut.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/81337593973.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/96980485378.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/zawatorukawusuma.pdfIn PDF document text
    • http://carszana.com/image/upload/File/povukibikibe.pdfIn PDF document text
    • http://lamay.de/userfiles/file/28359638272.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16094c34adc357---ratediwe.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/41147534176.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/74112962180.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/vikowinunaburegolonu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/4tb69hvigckj9966mdlrre4ab7/97673715745.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/28775401764.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/kenigaxa.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/3336841904.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/60554808120.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/81c4c1c5bfae6bcfd92aee7b6af78afd/80229481670.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/44666073165.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/22045367625.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3052bd90d6ab7970751aea07b7f43edf/78113568414.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/nebazavuwujufixoba.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/58594467057.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/rufudewolofuzuwun.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8db4a367af02c34b84445048873614a0/dujodafebuvubon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pdfmake+detect+page+breakPDF 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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 18412 bytes
SHA-256: 232176a05fc587969381e2ffa5dacf6126a8b421ceee46c00df7be034f32d519
font_02_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 10664 bytes
SHA-256: 81ef65c4939bf8babe0c615a316a6d002bc240284b23109eb8a31c85d3ec63d8

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