Malicious PDF — malware analysis report

Static analysis result for SHA-256 3133b7659edd36d8…

MALICIOUS

PDF

70.5 KB Created: 2021-09-12 04:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fc7c10e503de7e7ad85023831d81b434 SHA-1: 9b942f2b67d8dcae93beb72ff72f86b99ef71da4 SHA-256: 3133b7659edd36d8fc817a038cf9aed097bf035e614450265f7bf5e1677760f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely to facilitate the download of further malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://olsztyntransportmedyczny.pl/userfiles/file/41804919206.pdf In PDF document text
    • http://lsphc.com/userfiles/file///74075376930.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/13b742fe23cb0e815bf5daf2efd2c6ad/dokubamokuxasoruvazuruv.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d052cd27---80366432839.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec256041d---kexarigiviloxupenaju.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/lasapud.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee2fbc5b73---zumun.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/odcbj0voo0fel1n5pmk82lkdq1/82430544081.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/kibatukofulogirasib.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5befec223---71657080019.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca7288e45---fusolubedixoxep.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/bbba2817bd457984d96902bc8383d475/48233324581.pdfIn PDF document text
    • http://xfswchem.com/upload/files/bakamugusarepepi.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/leserowikokusirexigu.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210912085851.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091206175452086.pdfIn PDF document text
    • https://petribax.com/userfiles/file/67533258178.pdfIn PDF document text
    • https://mytopics.it/uploads/file/pixasewa.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/76264638205.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/tukaviliwez.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/tozazuxofofuta.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/dotokopifaxafabisawexelef.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/32676689632.pdfIn PDF document text
    • http://lgassociates.in/uploads/988440140.pdfIn PDF document text
    • http://sdes.in/uploads/miwomafajunipuvikunopekur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=download+game+battlefield+5+androidPDF 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_off0000b53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53A 15104 bytes
SHA-256: 34e79f1be42208e0228cd00d96cef430f54e8a631a2b9ec54065dbf7370774e6
font_01_sfnt_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 10892 bytes
SHA-256: 4b5af68bf38ffe283349b5250bb6f778ee166037f8a6f3b6cbd1d5553de6e43d
font_02_sfnt_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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