Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f963770b142aac…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 23:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 091174f58ef1998212175f9b422f866a SHA-1: 1c0cf61e2f9ccc59de448be6a469acf8751021af SHA-256: 76f963770b142aac15e7fab1f9588d915eb6eef48f393e3a7ffb1ecf87289bbc
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These URLs are often part of link farms designed to obscure the true malicious destination, leading to phishing or scam pages. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://studiovalecchi.it/userfiles/files/4138981953.pdf In PDF document text
    • http://kompletucetnictvi.cz/files/file/32387990989.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/tasasezuzumedeze.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/18010583579.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210916_113821.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/popifopupositijolunuv.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/ninafemem.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/jegorad.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/kotigakovek.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/beb1223e81c97d6d49e8dcf77103099f/23141525767.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/kalujubozimas.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/85111430052.pdfIn PDF document text
    • http://orthopediedelft.eu/files/95734508296.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210913182131.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/27419899752.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/vijesedidazigop.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea468f51f---92395991011.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161370f9737447---togedozijoxatizazanivapu.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/lodepupibogexetow.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/98383226339.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/raselareru.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/witevewudag.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3b7e27c2---4844426757.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/24989607247.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/zaxuzuxoribaz.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-01-00-57-17-90.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=high+and+low+the+movie+onlinePDF 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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 17900 bytes
SHA-256: 1ad3ce3ab2a84d4c89ef548ee7b9b317969f0d821fe981df72cbc45c88832000
font_01_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 10572 bytes
SHA-256: 69c8f5d33e615c78e175cff799c56dbcf7f89c76bd2b9b20d156ccf6cee4846f
font_02_sfnt_off00012ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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