Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d9da7f7cbdb9f7…

MALICIOUS

PDF

69.0 KB Created: 2021-09-09 04:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d68d81b409e7224102c658512c9337db SHA-1: 8e5256f6cb1317c49e55c33689f040b9b57bf274 SHA-256: 24d9da7f7cbdb9f76d7b3842b1cfd7d2b7a692e652c0b727d433f7d5963cffa6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure suggest it may exploit PDF vulnerabilities or lead to malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://sloplast.com/userfiles/files/73691031582.pdf In PDF document text
    • http://medical-1669.com/userfiles/files/21763723844.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/30495309914.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b24b839f0---97419880841.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcfc6b798---zimevemi.pdfIn PDF document text
    • http://lawngo.net/fckfiles/80523209991.pdfIn PDF document text
    • https://basisnomor.com/contents/files/favazifonewazexuradezar.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/92232840599.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/tenumafilupix.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/6234545761.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/35784088475.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/65059786985.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/noxerimomej.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/tipifexitowaxonuxux.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9c23b98d7d06e226a619ae97eea9d1e0/sasanofefo.pdfIn PDF document text
    • http://kahasat.cz/data/file/bevupako.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135e54883fae---nelifofim.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/25572768576.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevalagawugafowisatesal.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/xuditesadip.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/losugewasezaki.pdfIn PDF document text
    • https://bselink.com/userfiles/file/butili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hunter+assassin+appPDF 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_off0000ae57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE57 10172 bytes
SHA-256: 4f28824a7e6ccc897f0f00478d5af6ce360fcef44867a7e5fd5564c1076786b3
font_01_sfnt_off0000c530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 16904 bytes
SHA-256: 72b44c4978fb09f91f50b2ec63781a92cb98ae26ee733fb8b82de156f930470d