Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f7e642f68b8178…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 07:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65a8c266d80be347d8c3cf96508bbad1 SHA-1: 15e6c284b3f64df3cec1103fc29860de8e923ef9 SHA-256: e8f7e642f68b8178b5f8c16fe3fde588e9ff666180c0794839d66cede87c01aa
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate the PDF acts as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://cz-synergy.cz/data/file/daxemanilepepagon.pdf In PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/70375173130.pdfIn PDF document text
    • http://wwsm-us.com/files/file/25206122877.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/26393413350.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/43304807424.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/pavoxakerexinasawajo.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/fowunodogon.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc4f1eee4d---sumudugezeruwupas.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397ef877b52---xevusagugagugelu.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210906/0450186884.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zawiburafo.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/topexupezawomopa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161408f333ba22---34724847822.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/vetuver.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/19970782038.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0e4e6ac50---17812034908.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/tixijowirol.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613268acbb431---nibakosagurapu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614183ce6b642---somisapase.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/57154774510.pdfIn PDF document text
    • http://orthodoxnews.us/file/sotolujuwumojurisin.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/50375641441.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/30261548192.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/67535634264.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/zixijakitoxoxemujikepisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mortal+kombat+total+annihilationPDF 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_off0000b508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB508 17636 bytes
SHA-256: 1b2650a73cc741b6ce5847c518fb8c710a9562594358d5b1ecde2d34bac0113d
font_01_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 10300 bytes
SHA-256: a8f75cd500780e54ce1269e01ae564f0894d68f4cb58fc936d2afab454afdce0

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