Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97b03f8510e2f9d…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 11:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7faf787b0c93b753703586a58cd19a8 SHA-1: 574f6a7cf428d84e5a401424f0037bbf7bf4cd0f SHA-256: f97b03f8510e2f9d0b753f13917ff30d824660831650816e1d863e08b7f06b96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wittnebel.dk/file/mozemeposelujobexovoter.pdf In PDF document text
    • http://bwlpsalisbury.com/uploads/files/basugavoduzibewaje.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/nizebibikozedokozas.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/didiporodosemaredopuz.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109162108386955.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/noridufumuwirus.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/vatef.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/merogiruzu.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/23865710168.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/bamazo.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210908_338295A3A8E1BD90.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/027bbheq0bh3h2mnhd72fvleu7/sivowadematiposebidifigib.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/34483967030.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/697865454.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/radusi.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/nalojugedokemezodidu.pdfIn PDF document text
    • https://businesslife.com/content/files/74710775023.pdfIn PDF document text
    • http://ativn.com/upload/file/gefanalemiviximazunopamit.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/59559442925.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/rnct43k665iqtj5t959dcmkq9o/42876962704.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/31033987656.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/nivojuxivibidasisufun.pdfIn PDF document text
    • http://wohntraumgmbh.at/julolub.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309572189cf---waperegofinaxemut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=team+small+dogPDF 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_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 17768 bytes
SHA-256: 23feef14b292445528bcabd6d752a2e436201d549e0905adc59ecf04331ead1c
font_01_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC8 10160 bytes
SHA-256: 178eea44e9092e29de5e45aa4ebd22edb2ec8469e43972c89aa5df6c749b9e01

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