Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dce872df10648c2…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 14:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7d41f7d1134452e7063cfb1950f41d9 SHA-1: 49cf482debd6c196c0fcf6f5f40fa93dedb7ee7c SHA-256: 7dce872df10648c29fb596a839b32828d6140fbf1e44cafd9f1e97640f678152
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and functions as a link farm, directing users to multiple distinct hosts, many of which are associated with compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/6c3bd3004799ac91443cff233b7f0c94/nudimujixejodowifidubajuj.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/40305c1727608fbe67530777a8e48f7c/217591916.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607cebb7e1bfd---kitopag.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/muwatogixadojarajiwekanab.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/542df558317d586c922da1a566b2d7a2/bekerubimu.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/fumugepetaso.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/75701214941.pdfIn PDF document text
    • https://camphacement.vn/upload/files/55298450087.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9ed2c2175168ce6e3f07946e5852b9f3/tovigoxejiripebokej.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/wefanedelan.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6a9d296ac8497d95393d64e99683e492/lojiruputosodi.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612563f34420a---sepiboleze.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/robekasosaxenigor.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161134918db361---25324973610.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d102906c---95770038270.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/72064979518.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/11093956838.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae2272043---sofunij.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/19045923749.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb826677f2---96699930580.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a38b0be9a1370f1a86497c927edbc1cb/kidup.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f46292cc10---nepadulotud.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48f65c130f---rukixunikukelifowal.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/85963156297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=forest+animals+worksheetsPDF 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_off0000c826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 10528 bytes
SHA-256: 69e957dadf5c6235eddda747936dd8b3b7c825b64b831bdb62661828843f0b76
font_01_sfnt_off0000dff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF8 17968 bytes
SHA-256: 2e465691e61c24c948253e6f73ff6acf3a848f212589b5009f031ead864c8da9
font_02_sfnt_off00010e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1