Malicious PDF — malware analysis report

Static analysis result for SHA-256 284125eda5dc4b82…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 01:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 646ce8dddf5ce5767b6604821db06a98 SHA-1: e04bdfc2dcb24ea47f1adead94493e47062b8398 SHA-256: 284125eda5dc4b82b300e72e300481a14e6f22e73e74a9e4b7099580ea5c16e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. These links likely serve as redirects to phishing or malware hosting sites, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/243d7dd0bb67beddc2e1816feb3dd4bb/najuvadokuzokoravireji.pdf In PDF document text
    • http://nissanotogovap.vn/uploads/images/files/zajabonigiva.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/talexetibezijux.pdfIn PDF document text
    • http://stringladies.cz/userfiles/ginujejonerovilir.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/gawinetodufedeze.pdfIn PDF document text
    • https://etadelloro.it/images/file/fovewu.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/38986548748.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/nalafokoxobara.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a26ef1acc---xagazuvup.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/cecb3416f1b3ecb2685cafa620ec7a24/rofavimovumefer.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136f5b858733---jamubakaxav.pdfIn PDF document text
    • https://iohrp.org/f_files/files/dovesexituroniwolewekamu.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/dajibodukimal.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133795dee833---7507729635.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/37169550562.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6d35cf87---meletitukuleketirafalu.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210905212506_1u7o5a.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/galebigotojenetalabelar.pdfIn PDF document text
    • http://anpharma.net/upload/files/41888195290.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/rirufelek.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/91680256423.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/76744484687.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/salazabatuvo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394aad59674---weletoweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rda+brakes+catalogue+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_off0000cf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 16816 bytes
SHA-256: 6c24de8cf5965e23b64b3dab1f2425b9575901cef31c208c6aa4ffe0fddacdf5
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 10976 bytes
SHA-256: ddf8092e86035c93c72eeb7ef7ee54a36ac48d48d3ac08f41617674c261fb085

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