Malicious PDF — malware analysis report

Static analysis result for SHA-256 930aa1fee0b4d2f3…

MALICIOUS

PDF

77.4 KB Created: 2021-09-23 02:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e7b29d91d2c679409b2c965d0efc62f SHA-1: 37e143571e395a6bf163bccfb82839e514474807 SHA-256: 930aa1fee0b4d2f3873f75dedb4e5430e7ab49942d18ec17f207d9ac16c3ccfb
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via the embedded JavaScript and external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://kastely-vacduka.hu/fileok/file/1307170222.pdf In PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/65072194998.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/37857927419.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/wimekezujusa.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/65205286518.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/26309953336.pdfIn PDF document text
    • https://akconta.com/uploads/files/sakonosebutilamok.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/zupojamitanajobiwa.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ptvjrgq18gso9ohbu16ijuv5c0/27651992419.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/93015088438.pdfIn PDF document text
    • https://hsse.cl/files/fomelov.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613444276a243---88041460114.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/g6471tfcc4a2vl8jd7n7vn28gm/42602225400.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/suvipekowirukamijuvesesa.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/81049022177.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/rpbmn1udt6gi8uop6hsu5558ij/44827292336.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/raxinesizuxufipifegob.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/sisedewunoj.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/fofekuxapuwumamozodesuf.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/bubelonifu.pdfIn PDF document text
    • http://ossokahve.com/upload/file/rumudetitajasuvediripemop.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/falutukazuxurugugeduf.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/tibodavisoliregisowo.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/nomemunapudumamebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=photoshop+on+smartphone+app+downloadPDF 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_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 10652 bytes
SHA-256: 28169e453bd0d49c76f977bb576e723e3e50951c8143138074a4d389e47a4ffa
font_02_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 17112 bytes
SHA-256: 06e80bb9d57e2650f811beb3414766352493dc3ab986e90518f7b065e8d87a66

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