Malicious PDF — malware analysis report

Static analysis result for SHA-256 d233149caad5f5e4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 03:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7551e206a98fd016af8ac046e11df7c SHA-1: 2bbe7ee08e81f9078d26fb786469203e7082d71f SHA-256: d233149caad5f5e43c79c25a83221ac599977da0dc005539205482a08ce01a4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary function appears to be directing users to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=wonder+woman+1984+telugu+movierulz PDF link annotation
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161411e00bfdf1---10751545231.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/gixogatekakobe.pdfIn PDF document text
    • http://schokofontaene.de/idata/puzazujezo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613124ae2d617---87214800481.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/soviwep.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/90168486690.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/ridefisuwidejagapezed.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/57126564424.pdfIn PDF document text
    • http://retailcop.ca/files/23569310347.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/3717140952.pdfIn PDF document text
    • https://cecprint.com/images/file/78076566139.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/76518635444.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/23936933854.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/lakigemegege.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/54569743891.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/pulelufujizi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ab968f52a0621ce17cbf5caa91149796/bikowepozewuz.pdfIn PDF document text
    • http://marymo.ru/uploads/files/21254244056.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mefosanomuvumepijuzisitep.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/72158458521.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/dumamutade.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/ketilokegazomubapi.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_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 17752 bytes
SHA-256: c9fd6502d62e15c9d828a2ec8d2917d3afb36f27f29e24e3da0efa7a5541cf3c
font_02_sfnt_off000116f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F4 11236 bytes
SHA-256: 521892fe98a4096256354c5dff2844c09d2a43a9db70d3d551f96e185ee5d744