Malicious PDF — malware analysis report

Static analysis result for SHA-256 d094e66bc5ef56a1…

MALICIOUS

PDF

87.9 KB Created: 2021-08-10 09:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7be07ad1dcbf04c16d71babfd479d680 SHA-1: 2797fef8db35cb9c61e7f65d4d8db02e40e9067e SHA-256: d094e66bc5ef56a1540b12bc95881a347f9c419a5291f3431f4618809fe97a79
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to these sites for further exploitation or phishing. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/69a27a9a3f8ab1852d5554ec2e0de24b/4644121233.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a62d088c38d219de5b43e77ff47d2715/65660094205.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/pinerotawugu.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/mufasakek.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b16c88c2db---36552706878.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ddbd2ddf84847100f2943216d5d38dc5/90870731990.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210718123022139.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/i4mp12hijgd4jtjfsjc2d2jlcg/61143436586.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/st7a3ti0hc5uarmgsqke9dom9m/lujidup.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/tumetexibabenomuluvepago.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/38842189666.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/79697372541.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/2796964756.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/roxujujitidigaxasoluzaxab.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ba9e6547---farixoga.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/zufozobijebanurajixi.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/medexupilixojovufepexibat.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/10958935282.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/pozexubetedekusubewup.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/8692ab2bd2c772732d861d977a486af8/1365929351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=oraciones+bimembres+y+unimembres+analizadasPDF 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_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 17928 bytes
SHA-256: 48c11b93674d52751ae361fffa3af2f8823b2cec5420b6168f282d648a2ff0bd
font_01_sfnt_off00011ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BD 10872 bytes
SHA-256: f3ec6c79a2c382420c2ca4e225a57f7047c8e8d9cd163a143e9327a1fa3dd10e