Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc56f79d82bc274…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 14:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5d2a466c1dc6a9a6e86ff55bb05ab6b SHA-1: a9317398bc54f965faa7222b29c9aafe5097c774 SHA-256: ccc56f79d82bc27423c9d1a2741aa9bea10b372304dd97bedc13c06a64675465
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document impersonates a cloud document lure, attempting to trick the user into clicking on embedded links. Several heuristics indicate a link farm hosted on compromised or disposable domains, and ClamAV detected it as Pdf.Phishing.Trojan. While no scripts were directly extracted, the nature of the embedded links and the ML classification suggest it is designed to lead the user to a malicious site for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://ppuhperspektywa.pl/files/edytor/file/xiwexodewovo.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2e3da834be5bfe0570139668ffc76069/84327253800.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/26739272757.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/pinolewipusibagigi.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/bozonito.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b73dd60324c---wozutipaterikamisoraxu.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/66529517477.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/biwusadogivox.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/lujovafexafakewewemubixe.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210806214857.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/38d83ebc1f4fe96bb5d295db0f194b5f/bafefedevizavizumuxex.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/67732663454.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2279b2f76---96090132493.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/bipukido.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0873a7339---kawatusi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/2hpv8t2d4htmtnvr59h6bc9paj/25485257836.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/50671762968.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/23812821737.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/897cf6fadde2d65992d48e6af6e3ca53/57625013822.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c775850fcd23c1aa0cea7de48a6e453a/66728919894.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/fagefefujasaminusadalix.pdfIn PDF document text
    • http://charnafamily.com/clients/60216/File/47569964188.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b08201bc06637fbed2f7f6f0ba194f81/70742025636.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/44133015605.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/aa4dbf8fe28f73a706f1a737f7f9d561/33812789342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=onedrive+2016+tutorial+pdfPDF 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_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 17232 bytes
SHA-256: 658c3f015e70c0d61c6d64db96f76b2f6eb075b4336639cd401f7fdc133d174d
font_02_sfnt_off00011dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC7 10976 bytes
SHA-256: 6331fc9af5713e37fe8c67ed97c56ed8008e1bb54024579fb156b0c17a3ce505