Malicious PDF — malware analysis report

Static analysis result for SHA-256 19cd9aa8b385437c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 14:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 431eb3f75de74379407f47d6f489d215 SHA-1: c46a9fb22fb8a3bbc00f775f0ec723d41730b8a7 SHA-256: 19cd9aa8b385437c84940ae8279a5c13920fddb01b2155c56c7c5e66af7e0c4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that directs users to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedb0efb6d---37864672109.pdf In PDF document text
    • https://sharmtocairo.com/userfiles/files/naxopixufo.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/pezika.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/doxukaxubuja.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/kedejorunirokemovino.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/7684133698.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fcd91934480133a78e21889dfc02fd8d/debubepinetavar.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/walegovugegifaritapif.pdfIn PDF document text
    • https://isleo.com/i_photos/file/tujosixep.pdfIn PDF document text
    • http://status.cz/UserFiles/File/xavunuzakugonaj.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/76406464581.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1cf47e9a6dc35213036928a0ca72ea67/zawujunajimugubitivogepil.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/57738251680.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136472ab74fe---talepojoda.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/bebebusizidinavakibiliw.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/89229743329.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614386e81d5f2---4678154508.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/43298554705.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/84c65eb981f5e71beeafc00389522864/rugarofifedax.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210904_5821D66DB8A92876.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/jujibib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mejores+apps+para+ver+tv+androidPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/vizebepipeduv.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_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 10528 bytes
SHA-256: 1e94fcecebd24612c108c6fe2203efbce8868d90a057f7171c15edf439f19170
font_01_sfnt_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 18936 bytes
SHA-256: ca36f1f306f0c9f8bf61eae515a9f22500ee77790e2015ecea81958e92f4daf3
font_02_sfnt_off00013186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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