Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bee63125ed42a0c…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 13:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50dec05e87193f289981c0dc314a146b SHA-1: 1aa0126781fc3b935b29950b6698c707f3bd1e40 SHA-256: 5bee63125ed42a0c5d8a18551c615ea30f05cd8075d97d8bca519504346e4cde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves luring users through a phishing attachment to a link farm, which then likely serves as a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mutamobilya.com/images_upload/files/2583672209.pdf In PDF document text
    • https://jagominum.com/contents/files/nagofi.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/40497347408.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/21630403968.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/lakegawufemen.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/kiwaxowaloxidonol.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/11230487490.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/73725680708.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/78178624916.pdfIn PDF document text
    • https://stormester.no/files/file/vutoxidojejaxazerivuv.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/bamimixajebejakizafiko.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/zuxirawowetoras.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/88197108431.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9b80204279f4e9d496390ae4717100a4/xoxupejutezujufomini.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/6822531849.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/47327177937.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c3bddf16c5beed9140f27f3c24dfee4f/sosuzu.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/69717939628.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/negonubuz.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/gawedusifemukavuvuv.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/varatetudobesomalumef.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/264974da8e13f1102d3520b67753bdbf/bejotazitusifezinowivom.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/renekorigadaluruw.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/46037696709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=minion+rush+unlimited+tokens+and+bananas+apkPDF 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_off0000c1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 10980 bytes
SHA-256: 4bf82612c3e8fa4567991c00dd3b87e62e69435af3081703a7a0f3bf356182a9
font_02_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16668 bytes
SHA-256: 6e4384e2dc3f3e013bdcde5322279c130aa790b843ae002f49b70be3a642976f