Malicious PDF — malware analysis report

Static analysis result for SHA-256 338db13e94275d5a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 04:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9d8a32962280fb50e3f6036de86a95f SHA-1: 51d08c1fae285094cd4b174e0bd7f6770eb3ae9d SHA-256: 338db13e94275d5ac15e75dd62e59c62fa9404c673159a779f8fdcffe93be128
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and multiple external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript and link farm suggest an attempt to redirect the user to malicious content or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fiscconsulting.com/userfiles/file/kivuwudepotiri.pdf In PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109090826528765.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/kosifinuburopijekivume.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d7e0408c---xakifekelakuj.pdfIn PDF document text
    • https://kimansion.com/uploads/file/kagumigaxi.pdfIn PDF document text
    • http://vpsystem.com/files/fck/87459674957.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/61644011995.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/mevibomawiretogadetosupub.pdfIn PDF document text
    • http://skisun.it/userfiles/files/ginagemizulogu.pdfIn PDF document text
    • https://maymac.info/userfiles/file/xeboledifarisusubuwale.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/siwuruwufesebalaw.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/wuwikovenax.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/sejeji.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/dutukojelijes.pdfIn PDF document text
    • https://produse-zilan.ro/files/93835324050.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/nuvuduzasakewegekokuvamin.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/77f226493c813752989a4ff862bd1cf0/sifuxaduxafusoxojaxatabam.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/lebetevekewekubiduluziwom.pdfIn PDF document text
    • https://jagominum.com/contents/files/fidirikozuwedakebo.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/rejukimovo.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/vutabolakesagib.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/nukanoxemamitozexo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331b3a359de---30983637137.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/69590938307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=nigerian+movies+download+2020+downloadPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/vitonitikarokimerak.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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 10864 bytes
SHA-256: d145cde58f513ee95e3a70702fadbf0808d411cba9dbb1953621c1a3a60e1568
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 17692 bytes
SHA-256: 3947639e8ef77e652bb57e5b3448382d4ffc4437582fcdabd87ad3489edf530e
font_02_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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