Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ff772f17a53429…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 09:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e011f69e6828b6e817c764f8090e7e51 SHA-1: a61ae3cf1352392c39d0d8490167a4df171561e0 SHA-256: 12ff772f17a53429ebb2bcc4ee40ea8d2b0f2d8714f4a6157bba3b91f9631271
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, such as the one found at 'https://pistant.ru/uplcv?utm_term=tamilgun+dubbed+movies', which is designed to lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=tamilgun+dubbed+movies PDF link annotation
    • https://kiptep.ru/file/dogasuwivivemufimifitab.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e1eeec0674dc9f6e3cd5df82b2aa7ecc/28023024644.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/fijawuzal.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161369daa1d26d---96953498081.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/zubuponij.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/nejoxanokuzubemajadudugi.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/49849825998.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/50469271592.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/kepekotipaxubor.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355e1f4290e---29173633511.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/84ada3ba65b82ef045e1ebd5ab57b30a/64026080240.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d73f47f62918b6437a159b7eb390342/83384134123.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ff0760ca7e55ad70973142355ac59d37/92340569453.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/30243626758.pdfIn PDF document text
    • https://masukpt1.com/contents/files/64611198402.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/vupiwimunigare.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/88893e97c06cbcf59ce2b203ceed3e03/59724831845.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/leliru.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/lebaratafizazedexo.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/21382085292.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/15734744520.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/gupudigovuw.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_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 10664 bytes
SHA-256: 00cb5bb27fc60ce3d7c133a5519ba61ebe9a52fc214ed7cae521949934aabd85
font_01_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 20332 bytes
SHA-256: a8dc7ae80a47589156b9da367e4edf17f05dea6ce581eea9bda4dff5d62e94fb
font_02_sfnt_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1