Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3d6ebd84d1662b…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 15:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ccf3f226f1b70a3590e796cb53dcded SHA-1: a4bf3603aaa8a30f4301aaa44817903189e5ed8a SHA-256: 9d3d6ebd84d1662b9be301dfd01f0d0a4aedc5ae49e1f349765cd395bf68002d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=iphone+11+vs+note+10+camera PDF link annotation
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/xepexobivukodojozoj.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/76672254985.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa831fb95---kolovarexe.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/zapiwumerom.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/25968456240.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/3594361938.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/xaxibesusakoxafufivipujo.pdfIn PDF document text
    • http://goref.ru/files/file/mavironuli.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109110910247481.pdfIn PDF document text
    • http://orenprom.com/img/account/file/27501519121.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161484b8fc1947---jisazedulivaxubuzobu.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/56408754371.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/rowesedaporidas.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/lulezolefegera.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/rutonogepuvulixudugezafaj.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/99954849181.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/67621775256.pdfIn PDF document text
    • http://klenderbio.com/upload/files/34191782750.pdfIn PDF document text
    • http://htygroup.com/upload/files/xizidurufofe.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae752c195---29160665423.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/25605208851.pdfIn PDF document text
    • http://usagimatur.com/files/others/xipesebabexewawe.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/21463219722.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210906/210906202210112965r0z456h6j20z.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/45613422853.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/lunerefifipowakowiseton.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_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 10692 bytes
SHA-256: 9e55b4cfbb1b9861a0853cfbcf932f6e6cdd5164c5f7a6efe665395cad6308f7
font_01_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 18128 bytes
SHA-256: e4060e9fd525d7ee890656f9402beaaccf17ff2af85949406be649b5ee9eb703
font_02_sfnt_off00013003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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