Malicious PDF — malware analysis report

Static analysis result for SHA-256 4524124901cdd23e…

MALICIOUS

PDF

89.6 KB Created: 2021-09-05 22:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d75da45f588ef1b0f8602e384e73b1dc SHA-1: ee69e0006cb089b15e583808d0ed502dfae459c7 SHA-256: 4524124901cdd23e76e6d0e4a4cff23ea61ff6a2bd3b0aa0c9ac65bd7662f541
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV as a phishing trojan. It contains embedded JavaScript and presents a link farm pointing to compromised WordPress sites, likely intended to redirect users to phishing or malware distribution pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=traditional+vs+modern+education+pdf PDF link annotation
    • https://akapacha.com/userfiles/file/jowazolodokexusem.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/dakupim.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/vamewakejudorotowifibakaf.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210608_DBC57FDA3314BBF0.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/wubejujuxezebesileb.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/01dd919d7729a5b32644b76dd404aba5/16190278294.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16073be4c0ec52---gesuzuzesotifiwisi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/irc81hm1dljv7hdg3i47pn9d4q/mazog.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/2382820737.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/wadufogoguvafefeparu.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/790cd9782f7afce4b3e2b8fccaed190f/dotorajofajig.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/juxanite.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/81438936628.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/dogexagi.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160871dba66bd4---lelakitefig.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/a102f26eb03290849bb28b4fa5eb3792/tetazekozakololagomuluf.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087494a5cf33---mepolipugapo.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/58056312713.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0a6cf8ee---89393360065.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfb3991121---wixolex.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_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 10908 bytes
SHA-256: 388e523f022bebeec33528466a70349ae859b41282262bfc428f8c055be3ea44
font_01_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 19196 bytes
SHA-256: 08440dccba700fe87b766836ef8525c85e6359f776aac74e4bfa23defba4463e
font_02_sfnt_off00014101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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