Malicious PDF — malware analysis report

Static analysis result for SHA-256 620cbd1e8dd2b3fc…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 09:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e388e1a68e1aecbc547f33d32277a507 SHA-1: f9004040dbd1578c15ccd3ef7d747fcbe92ee604 SHA-256: 620cbd1e8dd2b3fc494f122d49ec748a9a30d5b6fe50597d85b86afcdc8e7173
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=modern+combat+3+apk+data+download PDF link annotation
    • https://jakspravnenapsa.cz/userfiles/file/83228722517.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/roranolebipukegojin.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/99063786239.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/35f01525d1b32cb59059c97c14a23741/88345681021.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/lebugogugejizozojetu.pdfIn PDF document text
    • http://ud2-140.com/files/52224033433.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/sisolutipovuwerijaf.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/gozupepimexonixavogulup.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/wifupo.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/kivujeriwivavawifare.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/vizuvegidug.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/vuledaxotigeluzigitij.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/pazimutegujopinef.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144bb079661b---jogowubavorazoritoj.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/jerojilonoxaxufumafes.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/39426221463.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/tubimunexujusas.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/tukemipuv.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/doxodasogefasovasazuje.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/dobekedojovagol.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4850398d---zujew.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/49320642276.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_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 17836 bytes
SHA-256: 3b27b82972df647fdfd8b911e064f107c94a0d9a63b827a4ed460cf3c56be9a4
font_01_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 10900 bytes
SHA-256: fe03fa3880d6999e7d513be501259ff3c50f4213881f7ce5ad81f6831a852d0e
font_02_sfnt_off000124e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1