Malicious PDF — malware analysis report

Static analysis result for SHA-256 398a4592e1b4ae6d…

MALICIOUS

PDF

84.3 KB Created: 2021-07-24 19:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a6cbc49e4278797f9be987d35efc667 SHA-1: 4d1f9a08b8944100a06b63e2af5a496a5964764a SHA-256: 398a4592e1b4ae6ddc41d582b9fc6de856895141183fc65129b3b453c723d9b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting, indicating a phishing or distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://spa-salon.ru/ckfinder/userfiles/files/wixemejanusolasijonaguju.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pjt7qqncvi6at1jrbckc2eo8eb/xosixetanusigukisova.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609849b5e883d---95461487034.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/63808726243.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090545fd9d50---mudafukesebisodukemuku.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ac709ff4fefabbe472826ac7a6176226/8252142078.pdfIn PDF document text
    • https://people11people.gr/uploads/File/texozivozosozofot.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/zifivuminelaroz.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/26632592480.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/dozitewomot.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d9173e0cb---25598037142.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/15559594250.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/magakazavoxuxipexeloz.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608560406fee2---96066398506.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072969a23549---bomanogefanarupom.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/zeforoziperumipasogexela.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/vasonizupuxegofexogoze.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/61323270271.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/0d3af5bf1f1e9c4db7790ade0f49878a/41248189832.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16084b0c8ced1c---69086938230.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160879a41d6f1f---bekojusadowizajos.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/c2175j1agb1k4qvr1qifi9e77o/dumixatorutoxawipuzugivuz.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7506c176f---pinovesiton.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/59822727574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=descargar+gratis+libro+una+vida+sin+limites+pdfPDF 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_off0000e096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 11268 bytes
SHA-256: 248916580be1b759df3345150fb3ed496d327dfa60bc8f6ae6c1aa6baa428914
font_01_sfnt_off0000faa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA2 18396 bytes
SHA-256: 56bddfc3cace6025ec34e076f243b3f9f2d5b89e1114db2db6f3d902099dd8a8
font_02_sfnt_off0001292b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1