Malicious PDF — malware analysis report

Static analysis result for SHA-256 7700a798186eff86…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 01:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3ec92c47f6db618cb4fffaac0602051 SHA-1: 449b91325c5259b4574c5b416b06ca444a7e0ac6 SHA-256: 7700a798186eff8624c902e5ec4d3986242446af0a388635864d428a806bc452
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e984d1b0---gafogonuvu.pdf In PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/kawuzuw.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/37779398549.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/72377762590.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/83802383137.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/96498846084.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/kaludivutomaratas.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f02ed16b5---magugoralasitosiwikimib.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/jexelapekatigonakifefuki.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/boguboriruxun.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/be4836c473f8855a6a94a9462be309a5/zikudekamimonowukimi.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/62391102366.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/60319478942.pdfIn PDF document text
    • https://led7.ru/file/43837588780.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/81107145020.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/70fe6ce9769f10ab523e1f08f0ce91f8/powurazasuwiwaleru.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/lejimexuturotexesadiw.pdfIn PDF document text
    • http://orlickachata.cz/files/files/jeluzagugikewurela.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/32563731712.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/zulojatopa.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/gabajobagopefibadi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/98215971416.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/sexituni.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/kavadenigobovasapebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=born+a+crime+pdf+downloadPDF 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_off0000d37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 18572 bytes
SHA-256: 8dfe5728ec76c36d17a6b02172ed1a7fe04b4c39d534b28166dd04a123baecb7
font_02_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 10656 bytes
SHA-256: 5d40947fa98796877f9430a56db240d88ff59afdaccea1735c635539302a747e