Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecbacf4ddd5d637…

MALICIOUS

PDF

101.4 KB Created: 2021-09-06 11:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6baba161839378345c022cb9b956e434 SHA-1: 6c89733486bb487769f3697b5e656ac865e9b2eb SHA-256: 4ecbacf4ddd5d637c85a3422a18c534335cdb8d33a2521e7b6d8fe7e156c4faa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high number of external links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the structure suggests an attempt to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

Heuristics 5

  • 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.
  • 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://eichler-kammerer.de/14693214814.pdf In PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161276293027e0---jidivimiga.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e330863936---merakupajubosixuga.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/munovuxiwixixixatabemedo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/a7ea5soi9jqlkeu80pgcc3s30c/34486457842.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/21522313938.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/62177846270.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/tiguxejoremipotojix.pdfIn PDF document text
    • https://bem-sa.com/img/file/xapovedigixekuzeruroz.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/95aa3d88d0f5ccd3c647684a129876e7/kuwubugasimipabituxiwuri.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/um1p677ptpncummjbbu0kgh7ag/22522699210.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/82967782729.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/11973005562.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/susovok.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/zexod.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/52l3dsr6eidl4ftq9b3v3n3l7b/75258857952.pdfIn PDF document text
    • https://alohasafaris.com/files/64831106174.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/mutinenowabemevekiwijanek.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780fb7a242d---80671250826.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773a9f0ba95---lejazijemexivakoza.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/41152562901.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/32493407890.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/10748011079.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5b23d5e1f265812c259f69828c51a870/melimigixumu.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/91201362119.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808bd50bcd9---40262890668.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7af30cccf507acd0852aef88d3eaca11/zuvegefup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=simone+weil+pdfPDF 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_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 24504 bytes
SHA-256: fac8f48f4f096c5f11f70d209919532da427dae932e409149c4406dfb9f8c8c8
font_01_sfnt_off000158c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C5 10292 bytes
SHA-256: 93ea1477e081ed5ab00fe19cdfe5b37fa4f96f2277501608c7b3f2c2f7f8aa27
font_02_sfnt_off00016fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1