Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b37109bc6279d9f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 12:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 90bbd580e7b585e6b56fc8b86160b249 SHA-1: 2e72efe4e383d9a73de2dbbbd730ec07964f124c SHA-256: 6b37109bc6279d9f8eb98ae61b4bb91614a32bd40cb3a208ffe4b96f161921a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=aladdin+2019+openload PDF link annotation
    • https://perfecthospitals.com/FCKeditor/file/boxozediredijap.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/478e5uva8gufdkaqk47golevp6/lagudizuvoxelodimamet.pdfIn PDF document text
    • https://spacio.hk/attachment/file/fejikuxemorumopanopep.pdfIn PDF document text
    • https://regenerateacademy.com/file/guvinodumerulidivolimebez.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/xovebosogoxax.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/lijogul.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/11178201075.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/sunatasog.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/vapalonorop.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/rebuxekuxogorokimidu.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612effaeae285---zadoxawika.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/lokowopokavesaru.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/rexivepuzi.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/70694840278.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161406dab71db9---57548077250.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/fetabo.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5feddc836---pimuwesowowatopobaravawis.pdfIn PDF document text
    • http://trovas.com/userimages/besivorugejuxiwe.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/l65dm2s7d4lltv12789ag2ggeg/wofodiwep.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/78953159033.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/28461351204.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/dubumaxotujirokusikakarut.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3833c4e36---65091963032.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_off0000ba5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5A 17024 bytes
SHA-256: 5f9bebc7c10aac72929cb4e062ddaf02de78b2569bfd9fb58e3a9ae13d291238
font_01_sfnt_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 10460 bytes
SHA-256: 1684ad765351a06db83437c60ca343f47cda4234965613e5eb3a236792e6a47d