Malicious PDF — malware analysis report

Static analysis result for SHA-256 b127c4669d9484b9…

MALICIOUS

PDF

89.4 KB Created: 2021-08-13 19:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86f829b096f2a204dee9132253bc7d82 SHA-1: af71bb248ac06255b693cf465e68b825365a974e SHA-256: b127c4669d9484b9da55b3deea057bcfebdfe5bae104212020a8cd2ba31e15ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These URLs are likely used to redirect users to malicious content, such as phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=oraciones+bimembres+y+unimembres+5+ejemplos PDF link annotation
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/532d4927b83271d0e47c59add55b3442/51236871992.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd3838906---60242000557.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/63437268789.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/45239371763.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/tafomugamewomirosum.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/3467410100.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/064b2a3dc8945aeb3a8991de5bced601/48350616438.pdfIn PDF document text
    • https://aneri12.eu/res/file/68789535074.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/20c78329f59311e5e8aea84cb1ab5ff7/gadarazapakexon.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/tatenaposonewusokuvikowij.pdfIn PDF document text
    • http://axwelindia.com/uploads/mekamulirufixasotujum.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/37390233794.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9a783435---fekezevamewobixegise.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/63521360071.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/sajuwaxexivafevusezopof.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608979858dca1---9033215882.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1b3daa977e518023360919a40c3fcb29/wesofatasasunaxefogibafa.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202171430185736.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/86187340020.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610786ed27fad---nozopetubakivomu.pdfIn PDF document text
    • https://mmtours.si/uploads/gafamewe.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/1b335hroahbmvkkjjt0mp1517v/99814326921.pdfIn PDF document text
    • http://prograsifkalip.com/files/kilibixusokex.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vuzemorureropi.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/bikezazeturipeg.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_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 11080 bytes
SHA-256: 741ee53dd82cf7b7ba073c2a62259922b594212c96c73fe3e4dc637b3e2baa43
font_01_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 18288 bytes
SHA-256: 8ea4230953d99a6e889f2b058afcbf9d9aa76dd88ac01535f0bf64f9380f2c95
font_02_sfnt_off00013d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1