Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aaeadd160600bd1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 22:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 291586c46f11c2220e93ce20624a05b4 SHA-1: 23ff4ba412ea5b9d51f3b983462820741b9c7164 SHA-256: 9aaeadd160600bd1b9b2c09c173d42bbd7ea8753e308711375481e3788b839b6
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to compromised websites, including a link farm on disposable hosting and a link to a compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to download or execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • 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://garglob.ru/uplcv?utm_term=angry+birds+space+emulator PDF link annotation
    • http://kangmeideyiliao.com/uploadfile/file///2021091402172811.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/lonijirefoba.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/659c8fda4825426831df7d7887e87932/75576962001.pdfIn PDF document text
    • http://santehnika34.ru/images/file/61329621963.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/latiritexapilovivutawe.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/lafupazupatona.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/84308033228.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/vumuxis.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/dogirujosiwida.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351bd62595f---raxiz.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/16173638308.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/dalavusoxuxasajewiv.pdfIn PDF document text
    • http://cpviettin.com/upload/files/17390428797.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/gumes.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/57764071772.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/todafogupo.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109041656475777.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/86275521300.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210913_E3FAE379C2DB2269.pdfIn PDF document text
    • http://htygroup.com/upload/files/numogisir.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210909_97A8A3B1A5A11A7C.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/xodebizakibubowo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ed1bd62d1---bakubire.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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 11192 bytes
SHA-256: 364121d3a6648d7f28e49bf5f201378bd8e5fdf77fd9a54f3a84dd4b8ae5b87a
font_01_sfnt_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 17196 bytes
SHA-256: 474842099668b3313f4a20bc3e29312a74b6564ddb8331ccf7ffe9a27e317364
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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