Malicious PDF — malware analysis report

Static analysis result for SHA-256 449102d7de22a7fa…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 06:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b138121cca1d229843875949d0b45df SHA-1: cded7969b1e6a6a96b690c08ad18e7f1daf0aad7 SHA-256: 449102d7de22a7fa318caf44c84ac165fd4b85a6ab4a4f3ada50d133dc25a815
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://marblobathware.ph/app/webroot/img/files/42312981041.pdf In PDF document text
    • http://bhk-aindling.de/userfiles/files/bezubu.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/rixixezotafowosejusozas.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/fajovokugugugazap.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/watime.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c74258a04---17154536380.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/66296982241.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/87525154956.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613919f6101e3---40938740749.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/63749496898.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/sixovi.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/34064376563.pdfIn PDF document text
    • http://www.pvvc.cz/files/jalulowe.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210909102818.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16130c87559fc1---fidinenonutizuravuvasixe.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/debuzo.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/6701091080.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/bogaregeneviwemiwavewi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379b9aa1f70---lisujimunurekufegin.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/27671898153.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021911628122433.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/50749721928.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/9805299849.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/43312108687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pool+party+moto+x3m+bike+race+gamePDF 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_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 17120 bytes
SHA-256: fd2a8f6dea58883c048d7518aeb2472c674f82f71bde4fa622f0d27057af3c4a
font_02_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 11064 bytes
SHA-256: e5ff621bfe84857aab9c1e5ad5ae3967d387e651859d2b2573b5a08e8d446f1d