Malicious PDF — malware analysis report

Static analysis result for SHA-256 717a921e0ce9672f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 07:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 597b491211adfec0d668a35a2d6bd6c0 SHA-1: e35aff4f042f6e466d94f874c448232e010ac387 SHA-256: 717a921e0ce9672fac8027b881243f1d2db5d566bdc00b23fbe7c7946773397d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the PDF links to compromised CMS uploads and is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8adca2c01e9937bfc5440478f507b40c/ruwitepokivepos.pdf In PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/rebowuwepaletalami.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/q9e1pjg2ohv0713e74megumvml/vimetebijasutamasuten.pdfIn PDF document text
    • http://regcureguide.com/files/files/96988378404.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b62ef2925bbb54334a6d758b99492e21/favolukekujokekuroxafo.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/85724436420.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/lesitogunodilikugogoreg.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/roxivu.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/rozojub.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/de395b09e279573ed23e1dcd046e039b/rejubusebazoz.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081948e5cb11---sujip.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/8vkdich09p82413736ot3cjdpr/nororok.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/memixevakaxitavujefiv.pdfIn PDF document text
    • http://szpk.hu/_user/file/pomobibimifim.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd106069a7---wojubivetojerana.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/578b82be9c93b61fe925a3484576c118/xozodopadadejusivekupawuk.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3b4a61c5d89f20c81fc44e964c09b20a/95955198985.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/83558034089.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609239fdd1ca5---bamigosezejerevu.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/e5ec0fcee6aaabac2a6004511f38867a/6404319933.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/20234879491.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/vajuronag.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/lubowopoluxipupugolujaxod.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/gofenoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=octavio+paz+libros+pdf+gratisPDF 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_off0000d325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3C 10852 bytes
SHA-256: b204b06dce9c63af963008b1deb67c7e7c4b74dcbaaf12eb534713f1fa1ddbf0
font_02_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 19232 bytes
SHA-256: 36f1a4ea24059a46996ef1308499609b67f7c56266a1d0ab51dcd27c5ab57898