Malicious PDF — malware analysis report

Static analysis result for SHA-256 1499c7b5fbbf3092…

MALICIOUS

PDF

96.1 KB Created: 2021-08-15 17:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 10c7134c6b44a1a2c0f86ef55baa3888 SHA-1: 9f5775a81f06cfbec287b476917943ccc79c154f SHA-256: 1499c7b5fbbf309276117a988f1f88a6e9b7d33567529ad9ae28aaeabc4e6232
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/48ba9be7c2f0609444424114074f1a89/61825531023.pdf In PDF document text
    • https://digireg.at/upload/47511969764.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/67252753298.pdfIn PDF document text
    • http://wahiclassof69.com/clients/874294/File/jigipo.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/betatedepij.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/21822950030.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/javusijexarag.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/xujifofaxekujelukemaze.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/12cbf5d599dc6f85b56a850964ad4e58/41544232325.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/kogelapabowaki.pdfIn PDF document text
    • http://soles2walk.cz/data/file/xixemo.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/i7gjt56517qvp87rdgmea0c810/tuderezud.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/b211c24790b8f17bbf5a55c9897a43c1/dilorugepesunivubozoweguj.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9d2bd9ee1ba0012415d5b815a156ab81/22776089276.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f096e2d6175---piguvuxisufilizon.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lukavuzinozusugide.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/62372494226.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072541958698---bakikowabapiferonegegogun.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/i55bb63bmug1kkfo6p3218qsn8/15523838544.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/misaroso.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/2014ce14d1596111f9c8cd6245815f54/92089957932.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/sigarovegokesejej.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/24132187699.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5e1e26ee3cdd6c8f97b1313bb292e035/36346929384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=clicker+heroes+2+cheat+codesPDF 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_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 10608 bytes
SHA-256: 3568d2d7299b71d028f4463bd036dec707f31523d2bcfbe45a238821dd0f4acb
font_01_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 18572 bytes
SHA-256: 2852aeb381131ce52cdc59d1de44b61d57b1a73030b75f383c86443876ba5cbe
font_02_sfnt_off00015a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1