Malicious PDF — malware analysis report

Static analysis result for SHA-256 83741ed1aa34d549…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 17:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 26358f29a3e08a4895a0f42a84bda71d SHA-1: dcbe43ccea5ec3152a1871bc70867846cb37f04e SHA-256: 83741ed1aa34d5493350d89835a40bc75905d2aa9278528f04ca6fa7b0c04940
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. This suggests the document's primary purpose is to redirect users to malicious sites, potentially for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=joomla+tutorial+pdf PDF link annotation
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/20ef5e92b6d744fa88de90af632c0196/vemumelowemubav.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acc25f7c44c---visigulimifi.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/dogep.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/judisesos.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/98467624838.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/novepuzetewilemafo.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e32b894aed2---bukogagokebu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/mimemew.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/13131985679.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/72879218844.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/zajitu.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/73585203846.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5dd9aac28---76987539290.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/23707461794.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/no2jr88qqb99mj8kqg7gvpdqp9/78424958387.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/58304800490.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/613ed88a3045509dfc0b2bd3bd5b3299/33714551871.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210728024747.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/92899471671.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/87965250698.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/sugewezuwefe.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621469185.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070ac3ef1ea6---xonigaxudokemobefed.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/rapaxozida.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/duperulutizoxugekupe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abee41c9b5a---katuwerufesasufinili.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_off0000cf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 17344 bytes
SHA-256: b9434ffaaad35ad67747fcb4f178a65b44f7102b7ddeaa1dea8eba24c5ba59f2
font_02_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 10348 bytes
SHA-256: 4c15df372a5f0e0e7d9e6f0206588d8b4241dd3bbcdb59ccfb0790ee9929ba22

Open this report in the interactive analyzer, or submit your own file for analysis.