Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68392f3b738cc68…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 04:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6c9313804047cdb25cf62055cc5f80c6 SHA-1: 4915490b3250a8e66b87416054ffc5e5d10f8874 SHA-256: f68392f3b738cc686fa3a30a760b0c9c89786cf562e0990f3702690f56a82a64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://tentauto23.ru/ckfinder/userfiles/files/nekikolixu.pdf In PDF document text
    • https://romalasergroup.com/userfiles/files/13005721454.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/8576025902.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/24082911706.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/22077839352.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/xotikirokuzugiva.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/47345065759.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/43422221138.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef2017dca3---25944922775.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/41283308264.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/purekosovox.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210902_FAFFCF7972BBC261.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/bedafezexatijavig.pdfIn PDF document text
    • http://asfalon.com/__files/file/lotadefesikafage.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/luperipa.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/vegodivelagesijinufajemat.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/99117902907.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/fobezokedobo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4a7a1aa5e9eddb9693b0d5ec2d5f5a56/mutepo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614250cc4fb8f---misetipeved.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/midizudivekusaxunejime.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/9161846714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=data+gta+ppssppPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/87912206553.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_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 17420 bytes
SHA-256: bf93026041e6a202ce937dc892baf4be00e18769bb98e7859fff7e55203df5d1
font_01_sfnt_off000101ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AC 9836 bytes
SHA-256: f9115867dee5187eb4bd9174aad7d1f28bcb767e1d7016cb6c581874461df3a4
font_02_sfnt_off00011773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1