Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cb7b37acdbc9fe…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 23:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5248d03bc76ccdb93387b287c8d1299 SHA-1: b805f7b7a6330ccc7f603948ace335f3ba5ced82 SHA-256: 45cb7b37acdbc9feca3f9659158f619529dbc86da0869833e17bf5d606d26645
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are part of link farms hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, pointing to attempts to leverage SEO or compromised infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=newer+super+mario+bros+ds+apk PDF link annotation
    • http://artecgroupservices.com/imagenes/file/lurasolebigafilibupamig.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/dotasiwovaxo.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/xetutezisuvutigefurarew.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/16676533822.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/93038494026.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/vezat.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/pabig.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/943356ac45385e5049e395b390090b6b/30503442975.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/nusadezuxodifexi.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/galagipoza.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/kigijag.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161480a703bf0a---15508692184.pdfIn PDF document text
    • http://alptw.com/images/files/bifowo.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/silukitidakodinemetabavos.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/fiterunijenu.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/ziliranominoneditu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468abc5f0e5---73521728814.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/polir.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16146af5742c10---wewolo.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/23126655005.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/2492041928.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/vuferusonujupanukod.pdfIn PDF document text
    • http://progetec.org/userfiles/files/74114512234.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/67685621450.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_off0000b246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB246 10700 bytes
SHA-256: 6b84f110ef0b91ad5d9f21ad6de045e91af213984b8508720c0356ee4796eb89
font_01_sfnt_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 16620 bytes
SHA-256: 0a378d73e3722e2189b84433d947c5444f6394093333e620bd957c6dadad191f
font_02_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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