Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b9cb64489ff00a…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 10:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 597d09e03d53b1d76476fcc9ca859057 SHA-1: 7d7b89371752d8dd050da034ef688492f43bcf9a SHA-256: 89b9cb64489ff00a583993a5478d6de88644f493409ca534780ed9b8f39de797
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised or disposable infrastructure, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic firings related to link farms and compromised CMS uploads further support this, indicating the PDF is designed to lure users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=cartoon+mod+apk PDF link annotation
    • http://www.farnostbobrova.cz/ckfinder/files/mowilu.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/wadawojitobawemaxomonodo.pdfIn PDF document text
    • https://halkum.rs/files/88768979944.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/najizabetaj.pdfIn PDF document text
    • https://petek.biz/resimler/files/wenubobalotojuze.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/79369313828.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/pavuzorawutozeva.pdfIn PDF document text
    • https://cubic.is/userfiles/file/fuxanovalusizare.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/o37vou7ds2n740lnavovtnrt60/jotinosaxuvorenaperogujum.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/jokuxuki.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/89433329043.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/25443268929.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c6d321dcc07b40b1526cce0f6c3ea442/25518022586.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/tabejimaf.pdfIn PDF document text
    • http://modero.vn/upload/files/23007252175.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/8281042382.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/nalexarowejutabevojilunuf.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/jixufijawilijuzos.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/52614339392.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/pifapigafopituvuv.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/55030982670.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/52932634489.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c55c82a73cb80f0beca97af4bc5e8683/77357127093.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///liwazisoluwujop.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_off0000aeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAE 10240 bytes
SHA-256: b2a8815581c4f1cc1b7c4ea45954239f0d7d5b7401710cd626110b2d42f63bc7
font_01_sfnt_off0000c59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59F 15272 bytes
SHA-256: 463e52ed63f7f93803c27296d66136dd250dc9cd08558b98b29861b81fdf2f9e
font_02_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1