Malicious PDF — malware analysis report

Static analysis result for SHA-256 8955d1d2cbfe8bd9…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 21:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83fc20bb7aefffb78972f2ac14d9497d SHA-1: ef05d4d182c1a2017ca39cc9e5c47fbe01d38637 SHA-256: 8955d1d2cbfe8bd9e23c9d70f086086fbfdf5e633f449f64bac1f6341227c9ad
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 disposable or compromised hosting domains, suggesting a link farm designed to distribute malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hasdeu.md/data/userfiles/files/xaxekutiguniliginovezokek.pdf In PDF document text
    • http://euphoriaclub.fun4two.pl/uploads/assets/file/26891526022.pdfIn PDF document text
    • http://ecogestval.es/userfiles/file/dazolitixinavekufomaba.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/49412251622.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/2579806958.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/benisiraraben.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/tunabefovupiwudimiwoguwu.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/jijuxagupanavazeto.pdfIn PDF document text
    • http://tokado.ua/media/file/46584273666.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/xuwuzovebaziba.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfeda205be---83699908245.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/58858374112.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/ruwunijem.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6758d84cd---22357912117.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613e321b04768---xabilurilaf.pdfIn PDF document text
    • http://halanmilk.com/upload/files/nagirinebomupesa.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/65196985321.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/83135708961.pdfIn PDF document text
    • http://theponghop.com/upload/files/17143406939.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/wumowuvutuli.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/jexodoxodupi.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/87436512978.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/9922771498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=photo+lab+picture+editor+face+effects+art+framesPDF 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_off0000b46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 11020 bytes
SHA-256: 679694a68bff3480b9c5863f52ab97ced86b47b823445f483a2aa339a7258e74
font_02_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 18304 bytes
SHA-256: c9dd57e3207ec03dd623853ce856b9ec796b436a2aa5c509df8b6e74ce95ac37